This test quantifies L-methionine — an essential sulfur-containing amino acid that serves as the precursor to S-adenosylmethionine (SAMe), cysteine, and glutathione, and plays a central role in methylation reactions, liver detoxification, and antioxidant defense — in dietary supplements, protein blends, amino acid formulations, and raw materials using Liquid Chromatography coupled with Tandem Mass Spectrometry (LC-MS/MS). Accurate quantification is important for label claim verification and for confirming the methionine contribution in complete protein and multi-amino acid formulations. LC-MS/MS provides the sensitivity and compound-specific selectivity needed to accurately quantify L-methionine in complex matrices. Results are reported as a percentage or in milligrams per gram or per serving.

A representative sample is accurately weighed and dissolved or hydrolyzed in a suitable aqueous solvent, with care taken to minimize oxidation of the sulfur-containing side chain during sample preparation. An isotopically labeled internal standard (e.g., ¹³C- or ²H-labeled L-methionine) is added prior to sample preparation to correct for matrix effects and recovery variability. The extract is filtered and analyzed by reversed-phase or HILIC LC-MS/MS, with detection by electrospray ionization (ESI) in positive ion mode using multiple reaction monitoring (MRM) transitions specific to L-methionine. Quantification is performed against a multi-point external calibration curve prepared from a certified L-methionine reference standard. Quality control samples at multiple concentration levels are run concurrently to confirm method accuracy, precision, and linearity throughout the analytical run.

L-methionine is an essential amino acid with a reactive sulfur-containing side chain that is susceptible to oxidation to methionine sulfoxide during processing and storage, potentially reducing bioavailability and potency. LC-MS/MS with MRM detection provides the compound-specific selectivity needed to specifically quantify intact L-methionine and distinguish it from its oxidized form and other sulfur-containing amino acids such as cysteine and homocysteine in complex matrices. This level of analytical rigor supports label claim accuracy, raw material qualification, and cGMP compliance under 21 CFR 111.

This test quantifies L-phenylalanine — an essential aromatic amino acid that serves as a precursor to tyrosine, dopamine, norepinephrine, and epinephrine — in dietary supplements, amino acid blends, protein hydrolysates, and raw materials using High-Performance Liquid Chromatography (HPLC). Accurate quantification is critical for label claim verification, ensuring that the declared amount of this essential amino acid is present in the finished product. This test is also relevant for products bearing phenylalanine content disclosures required for individuals with phenylketonuria (PKU), a metabolic disorder in which phenylalanine cannot be properly metabolized. Results are reported as a percentage or in milligrams per serving.

A representative sample is accurately weighed and hydrolyzed under acidic conditions (e.g., 6N hydrochloric acid at elevated temperature) if present in a protein-bound form, or dissolved directly in a suitable buffer if in free amino acid form. The sample is derivatized using a pre-column or post-column reagent — such as o-phthalaldehyde (OPA), phenylisothiocyanate (PITC), or 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate (AQC) — to enable UV or fluorescence detection. Separation is performed by reversed-phase HPLC on a C18 column, and quantification is performed against a multi-point external calibration curve prepared from a certified L-phenylalanine reference standard. System suitability and quality control standards are run concurrently to confirm method accuracy and precision.

L-phenylalanine is an essential amino acid that cannot be synthesized by the human body and must be obtained through diet or supplementation, making accurate potency verification important for product efficacy and consumer safety. Critically, phenylalanine is a mandatory disclosure ingredient for individuals with PKU, and inaccurate labeling of phenylalanine content in food and supplement products poses a direct health risk to this population. HPLC with derivatization provides the sensitivity and specificity needed to accurately quantify L-phenylalanine in complex amino acid and protein matrices, supporting both label claim compliance and regulatory disclosure requirements under 21 CFR 101 and 111.

This test quantifies L-Proline, an important amino acid relevant for nutritional and quality assessment, using Liquid Chromatography–Tandem Mass Spectrometry (LC-MS/MS). It is applicable to various matrices including raw materials, powders, capsules, and finished products. The method provides sensitive detection with a reporting limit of 0.1 mg/kg, ensuring accurate measurement for quality control purposes.

Samples are prepared by extracting 0.5 g of material with 10 mL of 0.1% formic acid in water, followed by centrifugation and filtration. The extract is analyzed using LC-MS/MS with electrospray ionization in positive mode, monitoring L-Proline transitions in multiple reaction monitoring (MRM) mode. Quantification is performed using an external calibration curve constructed from certified L-Proline standards ranging from 0.1 to 100 mg/L. Quality control includes duplicate injections, analysis of spiked samples for recovery assessment, and periodic injection of QC standards to verify instrument performance.

Results are reported in mg/g (raw material) or mg/serving (finished product). Testing confirms label accuracy, verifies raw material purity, and supports consistent manufacturing quality.

This assay quantifies L-theanine, a naturally occurring amino acid found in green tea and commonly used in calming and nootropic supplements. Using HPLC, it verifies L-theanine content in capsules, powders, and beverages to confirm label claims and ensure consistent dosing.

Samples are extracted in aqueous or acidic solution and analyzed by HPLC with UV detection at a compound-specific wavelength. Quantification is performed using certified L-theanine standards, with internal standard correction and duplicate injections to ensure accuracy and reproducibility.

Results are reported in mg per g or per serving. Values are compared to formulation targets and label claims to confirm active content and detect any degradation or underformulation.

This test quantifies L-threonine — an essential amino acid that plays a critical role in protein synthesis, immune globulin production, intestinal mucosal integrity, and collagen formation — in dietary supplements, protein blends, amino acid formulations, and raw materials using Liquid Chromatography coupled with Tandem Mass Spectrometry (LC-MS/MS). Accurate quantification is important for label claim verification in amino acid and protein supplement products, as well as for confirming the threonine contribution in complete protein and BCAA formulations. LC-MS/MS provides the sensitivity and compound-specific selectivity needed to accurately quantify L-threonine in complex amino acid matrices. Results are reported as a percentage or in milligrams per gram or per serving.

A representative sample is accurately weighed and dissolved or hydrolyzed in a suitable aqueous solvent. An isotopically labeled internal standard (e.g., ¹³C- or ²H-labeled L-threonine) is added prior to sample preparation to correct for matrix effects and recovery variability. The extract is filtered and analyzed by reversed-phase or HILIC LC-MS/MS, with detection by electrospray ionization (ESI) in positive ion mode using multiple reaction monitoring (MRM) transitions specific to L-threonine. Quantification is performed against a multi-point external calibration curve prepared from a certified L-threonine reference standard. Quality control samples at multiple concentration levels are run concurrently to confirm method accuracy, precision, and linearity throughout the analytical run.

L-threonine is an essential amino acid that cannot be synthesized by the human body, making accurate potency verification important for confirming that supplement products deliver the declared dose. LC-MS/MS with MRM detection provides the compound-specific selectivity needed to unambiguously quantify L-threonine in complex protein and amino acid matrices, where co-eluting amino acids may interfere with less selective analytical methods. This level of analytical rigor supports label claim accuracy, raw material qualification, and cGMP compliance under 21 CFR 111.

This test quantifies L-Tryptophan, an essential amino acid important for nutritional and quality control purposes, using Liquid Chromatography–Tandem Mass Spectrometry (LC-MS/MS). It is suitable for analyzing raw materials, finished products, capsules, and powders. The method provides high specificity and sensitivity with detection limits typically in the low nanogram per milliliter range.

Samples are first extracted with a methanol-water solution to release L-Tryptophan, followed by filtration to remove particulates. The extract is injected into an LC-MS/MS system operating in Multiple Reaction Monitoring (MRM) mode, using electrospray ionization in positive mode. Separation is achieved on a reversed-phase C18 column with a gradient mobile phase of water and acetonitrile containing 0.1% formic acid. Quantification is performed using a calibration curve constructed from certified L-Tryptophan standards, with an isotopically labeled internal standard to correct for matrix effects and instrument variability. Method accuracy and precision are verified through duplicate injections, quality control samples, and spike recovery experiments.

Testing confirms label claims, verifies raw material purity, and supports batch-to-batch consistency.

This test quantifies L-Tyrosine, an important amino acid, in raw materials, powders, capsules, and finished products using High-Performance Liquid Chromatography (HPLC). Accurate measurement of L-Tyrosine ensures product quality and compliance with nutritional specifications. The assay has a detection limit of 0.1 mg/g, providing sensitive and precise quantification.

Samples are prepared by aqueous extraction followed by filtration to remove particulates. The extract is injected into an HPLC system equipped with a C18 reversed-phase column and UV detection at 274 nm, specific for L-Tyrosine. Quantification is achieved using an external calibration curve constructed from certified L-Tyrosine reference standards over a defined concentration range. Method precision is confirmed by duplicate injections and quality control samples, while spike recovery tests validate accuracy.

Results are reported in mg/g (raw material) or mg/serving (finished products). Testing confirms label claims, verifies raw material purity, and ensures batch-to-batch consistency in amino acid formulations.

This assay detects and quantifies lupin protein using a validated ELISA (Enzyme-Linked Immunosorbent Assay). It is used to confirm the presence or absence of lupin contamination in raw materials, finished products, and production environments—critical for meeting allergen labeling regulations in regions where lupin is a regulated allergen (e.g., EU, Australia).

Samples are extracted and tested using a sandwich ELISA specific to lupin protein. The method uses antibody-based colorimetric detection and quantifies results using a certified standard curve. Positive and negative controls are included to ensure accuracy.

Results are reported in ppm (mg/kg) of lupin protein. The method typically detects trace levels as low as 1–5 ppm depending on the matrix, making it suitable for allergen-free claim verification or contamination screening.

This assay quantifies lutein, a carotenoid found in marigold extract and leafy greens, commonly used in vision support and antioxidant supplements. Using HPLC, it measures lutein content in raw materials and finished products to confirm potency and support structure-function claims.

Samples are extracted using organic solvents (typically hexane or ethanol-based), then analyzed by HPLC with UV-Vis detection at a compound-specific wavelength (typically ~445 nm). Quantification is performed using certified lutein standards, with internal standard correction and duplicate injections for accuracy.

Results are reported in mg per g or per serving. Values are compared to formulation targets and declared label claims to confirm standardization and detect degradation or adulteration.

This test quantifies L-valine — one of the three branched-chain amino acids (BCAAs), alongside leucine and isoleucine — in dietary supplements, protein blends, amino acid formulations, and raw materials using Liquid Chromatography coupled with Tandem Mass Spectrometry (LC-MS/MS). L-valine plays an important role in muscle tissue repair, nitrogen balance, and energy production during sustained exercise, and is a standard component of BCAA and sports nutrition formulations. LC-MS/MS provides the sensitivity and specificity required to accurately quantify L-valine and distinguish it from co-eluting structural isomers in complex amino acid matrices. Results are reported as a percentage or in milligrams per serving to support label claim verification and cGMP compliance.

A representative sample is accurately weighed and dissolved or hydrolyzed in a suitable aqueous solvent. An isotopically labeled internal standard (e.g., ¹³C- or ²H-labeled L-valine) is added prior to sample preparation to correct for matrix effects and recovery variability. The sample is filtered and injected onto a reversed-phase or HILIC LC column for chromatographic separation. Detection is performed by electrospray ionization (ESI) in positive ion mode, with multiple reaction monitoring (MRM) transitions selected to provide highly specific quantification of L-valine. Quantification is performed against a multi-point external calibration curve prepared from a certified L-valine reference standard. Quality control samples at multiple concentration levels are analyzed concurrently to confirm method accuracy, precision, and linearity throughout the analytical run.

Accurate quantification of individual BCAAs — including L-valine — is essential for verifying the declared BCAA ratio and total amino acid content in sports nutrition products, where precise formulation is a key product claim and consumer expectation. LC-MS/MS with MRM detection provides the compound-specific selectivity needed to unambiguously quantify L-valine alongside leucine and isoleucine in complex protein and amino acid matrices, where standard HPLC methods may not provide sufficient resolution between structural isomers. This level of analytical specificity supports both raw material qualification and finished product release testing under 21 CFR 111 cGMP requirements.

This test quantifies lycopene, a fat-soluble carotenoid pigment found predominantly in tomatoes and tomato-derived ingredients, in dietary supplements, food products, and raw materials using High-Performance Liquid Chromatography with UV/Visible detection (HPLC-UV/Vis). Lycopene is one of the most studied carotenoids for its antioxidant activity and its association with prostate and cardiovascular health. Results are reported in mg per serving or mg per gram to support label claim verification and cGMP compliance.

A representative sample is weighed and subjected to saponification using an ethanolic potassium hydroxide solution to hydrolyze esterified carotenoids, followed by liquid-liquid extraction with an organic solvent such as hexane or ethyl acetate to isolate lycopene. The extract is evaporated under nitrogen, reconstituted in mobile phase, and injected onto a reversed-phase C18 or C30 HPLC column — C30 columns are preferred for improved resolution of lycopene from structurally similar carotenoid isomers. Detection is performed by UV/Vis at approximately 472 nm, corresponding to the characteristic visible absorbance of lycopene. All sample preparation steps are conducted under amber or reduced-light conditions to prevent photodegradation, and quantification is performed against a multi-point external calibration curve prepared from a certified lycopene reference standard.

Lycopene is highly susceptible to oxidative and photodegradation, and its accurate quantification requires careful sample handling combined with a chromatographic method capable of resolving it from cis-isomers and co-present carotenoids such as beta-carotene and phytoene. HPLC with UV/Vis detection at 472 nm provides the sensitivity and selectivity needed for reliable potency measurement across softgel, powder, and oil-based supplement formats, ensuring label claim accuracy and raw material qualification.

This assay detects and quantifies macadamia nut protein using a specific ELISA (Enzyme-Linked Immunosorbent Assay). It verifies the presence or absence of macadamia contamination in raw materials, finished products, or facility environments—helping manufacturers meet allergen labeling regulations and avoid cross-contact issues.

Samples are extracted and analyzed using a macadamia-specific sandwich ELISA. The method uses antibody-based detection with colorimetric readout and compares results to a validated standard curve. Duplicate wells and control samples ensure reliable results.

Results are reported in ppm (mg/kg) of macadamia protein. Detection limits typically range from 1–5 ppm, allowing for sensitive identification of trace contamination to support “nut-free” claims or allergen risk management.

This test confirms the botanical identity of maca root (Lepidium meyenii) in raw materials and finished products using High-Performance Thin-Layer Chromatography (HPTLC). HPTLC generates a characteristic chromatographic fingerprint based on maca's unique glucosinolate and alkaloid marker compounds, which is compared against a certified Lepidium meyenii reference standard to confirm species authenticity and detect substitution or adulteration. Results are reported as confirmed identity or non-conforming.

A representative sample is extracted using methanol or an aqueous-organic solvent system and applied alongside a certified maca root reference standard onto an HPTLC silica gel plate using an automated applicator. The plate is developed in a validated solvent system, dried, and derivatized with an appropriate detection reagent to visualize the characteristic marker bands associated with maca's glucosinolate and macamide profile. The resulting fingerprint is compared visually and by densitometric scanning to the reference standard pattern. Identity is confirmed when the sample fingerprint matches the reference in terms of Rf values, band positions, and color profile, per established HPTLC botanical identity methods.

Maca root is a premium Andean botanical that commands a significant price premium, making it a target for substitution with less expensive root powders or unrelated starch-based fillers. HPTLC identity testing provides a rapid and scientifically defensible confirmation of botanical species, supporting supplier qualification, and label accuracy.

This assay measures magnesium (Mg) using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The method provides highly sensitive and accurate elemental quantification across a wide range of matrices.

Samples are digested and analyzed by ICP-MS under validated conditions. Magnesium is ionized in the plasma and detected by mass spectrometry. Calibration with certified reference standards and internal controls ensures accuracy and reproducibility.

Testing verifies label claims, confirms elemental purity, and supports consistent formulation and regulatory compliance.

This test quantifies total elemental magnesium in blended raw materials and dietary supplements containing multiple magnesium salt forms — specifically magnesium glycinate, magnesium oxide, and magnesium citrate — using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Each magnesium salt form contributes a different theoretical percentage of elemental magnesium (magnesium oxide ~60%, magnesium citrate ~16%, magnesium glycinate ~14%), and accurate measurement of total elemental magnesium is essential for verifying that the combined blend delivers the declared milligrams of elemental magnesium per serving as required under 21 CFR 101 nutritional labeling regulations. ICP-MS provides the sensitivity and multi-element capability needed to precisely quantify magnesium in complex blended matrices. Results are reported in milligrams of elemental magnesium per gram or per serving.

A representative sample is accurately weighed and subjected to complete acid digestion using a validated microwave-assisted or hot block digestion procedure with concentrated nitric acid and, where necessary, hydrochloric acid or hydrogen peroxide, to fully dissolve all magnesium salt forms and convert magnesium to a soluble ionic form. The digested solution is diluted to volume with ultrapure water and analyzed by ICP-MS using an appropriate internal standard (e.g., ⁴⁵Sc or ⁶⁹Ga) to correct for matrix effects and instrument drift. Magnesium is quantified by monitoring the ²⁴Mg isotope against a multi-point external calibration curve prepared from a certified magnesium reference standard traceable to NIST. Certified reference materials and method blanks are analyzed concurrently to confirm digestion efficiency, accuracy, and precision.

ICP-MS is the preferred method for elemental magnesium quantification in complex blended matrices because it provides accurate, precise, and sensitive measurement of total elemental magnesium regardless of the salt form present, without requiring separate assays for each individual magnesium species. This is particularly important for multi-form magnesium blends where the varying solubility and matrix behavior of glycinate, oxide, and citrate salts could compromise the accuracy of less specific methods such as titration or colorimetric assays. Reporting total elemental magnesium ensures direct alignment with label claims and regulatory requirements under 21 CFR 101, and supports raw material qualification and cGMP compliance under 21 CFR 111.

This test quantifies magnesium content in dietary supplements, mineral ingredients, and raw materials using complexometric titration, typically with EDTA (ethylenediaminetetraacetic acid) as the chelating titrant. Magnesium is an essential macromineral involved in over 300 enzymatic reactions, including energy metabolism, muscle contraction, nerve function, and bone health. Titration provides a reliable, cost-effective, and well-established method for determining magnesium content in high-purity mineral salts and supplement formulations. Results are reported as a percentage or in milligrams per gram or per serving to support label claim verification and cGMP compliance.

A representative sample is accurately weighed and dissolved in dilute acid (typically hydrochloric or nitric acid) to ensure complete dissolution of the magnesium salt. The solution is adjusted to an appropriate pH (typically pH 10 using an ammonia buffer) and a metal indicator such as Eriochrome Black T (EBT) or Calmagite is added. The sample is titrated with a standardized EDTA solution until the endpoint color change is observed (from red/wine to blue), indicating complete chelation of the magnesium ions. Magnesium content is calculated from the volume and molarity of EDTA consumed relative to the sample weight. Blank titrations and reference standard checks are performed concurrently to confirm titrant standardization and method accuracy.

Complexometric EDTA titration is a classical, pharmacopoeial-recognized method for the quantification of divalent metal ions including magnesium, and is widely used for the release testing of magnesium-containing raw materials and finished products. The method is particularly well suited for high-purity magnesium salts (e.g., magnesium oxide, magnesium citrate, magnesium glycinate) where magnesium is the primary analyte and matrix interference is minimal. Titration offers a rapid, cost-effective alternative to instrumental methods such as ICP-MS or ICP-OES for routine magnesium quantification, supporting raw material qualification and label claim compliance under 21 CFR 111.

This assay quantifies malic acid, a naturally occurring organic acid found in fruits and commonly added as an acidulant in foods, beverages, and supplements. Using LC-MS/MS, it measures malic acid content to confirm formulation accuracy, detect adulteration, and verify nutrition or ingredient label claims.

Samples are extracted in aqueous solvent and analyzed by LC-MS/MS using compound-specific mass transitions. Quantification is performed with certified malic acid standards, using internal standard correction and duplicate injections to ensure sensitivity and reproducibility. The method allows detection of both natural and added malic acid in complex matrices.

Results are reported in mg per g, mg per 100 mL, or per serving depending on the product matrix. Values are compared against declared label claims, formulation targets, or regulatory specifications to ensure accuracy and product quality.

This test identifies and quantifies maltodextrin — a mixture of glucose oligomers derived from starch hydrolysis — in dietary supplements, protein powders, and raw materials using High-Performance Liquid Chromatography (HPLC). Maltodextrin is widely used as a bulking agent, carrier, and carbohydrate source in supplement formulations, and its accurate characterization is important for label transparency, carbohydrate content verification, and detection of undeclared use as a filler. Results are reported as a percentage of total carbohydrate content or mg per gram as applicable.

A representative sample is weighed and dissolved in warm deionized water with sonication to ensure complete solubilization of the maltodextrin oligomers. Quantification is performed against a multi-point calibration curve prepared from certified maltodextrin or glucose oligomer reference standards.

This test quantifies manganese, an essential trace mineral that serves as a cofactor for antioxidant enzymes, bone formation, and metabolic pathways involving carbohydrates and amino acids, in dietary supplements, food products, and raw materials using Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Manganese is a declared nutrient on supplement facts panels and must be accurately quantified to support label claim verification, raw material qualification, and cGMP compliance. Results are reported in mg or µg per serving or per gram, as applicable.

A representative sample is digested using microwave-assisted acid digestion with a nitric acid and hydrogen peroxide mixture to fully dissolve the matrix and bring all manganese into solution. The digested solution is diluted to volume and analyzed by ICP-MS, where manganese is detected and quantified based on its characteristic mass-to-charge ratio. Quantification is performed against a multi-point external calibration curve prepared from a certified manganese reference standard, with an appropriate internal standard used to correct for matrix effects and instrument drift. Certified reference materials and method blanks are analyzed concurrently to confirm accuracy and recovery.

Manganese is a required nutrient declaration on supplement facts panels when present at ≥2% of the Daily Value, and accurate quantification is essential for label compliance. Manganese can be present at elevated levels in certain botanical raw materials — particularly green tea, grains, and legume-derived ingredients — making accurate measurement important for both potency claims and safety assessment given that chronic high manganese intake is associated with neurological effects. ICP-MS provides the sensitivity and multi-element capability needed for reliable quantification across diverse supplement and food matrices.

This assay quantifies melamine, a nitrogen-rich industrial chemical that may be illegally added to artificially inflate protein content. Using LC-MS/MS, it detects trace levels of melamine in food, beverages, supplements, and raw materials to ensure compliance with FDA, EFSA, and Codex safety limits.

Samples are extracted with aqueous or acidified solvents and analyzed by LC-MS/MS with compound-specific mass transitions. Quantification is performed using certified melamine standards, with internal standard correction and duplicate injections to ensure sensitivity and reproducibility. This method allows detection at very low ppb levels suitable for regulatory compliance.

Results are reported in ppm (mg/kg) or ppb (µg/kg), depending on the matrix. Values are compared against international limits (e.g., Codex and FDA typically ≤ 1 ppm in infant formula, ≤ 2.5 ppm in other foods) to confirm safety and detect adulteration.

This assay quantifies melatonin, a hormone commonly used in sleep-support supplements. Using HPLC, it verifies melatonin content in tablets, capsules, powders, and functional blends to ensure label accuracy and proper dosing in products designed for rest and relaxation.

Samples are extracted using aqueous or methanolic solvents and analyzed by HPLC with UV detection at a compound-specific wavelength. Quantification is performed using certified melatonin standards, with internal standard correction and duplicate injections to ensure precision.

Results are reported in mg per g or per serving. Values are compared with formulation targets and declared label claims to confirm potency, detect over- or under-formulation, and ensure product consistency.

This test determines the melting point of a solid raw material or ingredient using the method described in USP <741> (Melting Range or Temperature). The melting point is a fundamental physical characteristic used to confirm the identity and assess the purity of a substance — impurities and polymorphic variations typically cause a depression or broadening of the expected melting range. This test is commonly applied to pharmaceutical-grade excipients, active ingredients, fatty acids, waxes, and other solid materials where melting point is a defined specification parameter. Results are reported as the observed melting range in degrees Celsius (°C) and compared against the USP monograph or supplier specification.

A small quantity of the dry, finely powdered sample is introduced into a capillary tube, which is placed in a calibrated melting point apparatus. The temperature is raised at a controlled, defined rate as specified in USP <741>. The temperature at which the sample begins to liquefy (onset) and the temperature at which it is completely melted (clear point) are recorded. The observed melting range is compared against the reference specification for the material under test. The apparatus is calibrated using certified melting point reference standards prior to sample analysis to confirm temperature accuracy.

Melting point determination is one of the oldest and most straightforward physical identity tests in pharmacopoeial analysis, and is required or recommended in numerous USP ingredient monographs as a rapid, non-destructive means of confirming material identity and detecting gross impurities or adulteration. A melting point that falls outside the expected range — or a broadened melting range — can indicate the presence of impurities, incorrect polymorph, or substitution with a different material. USP <741> provides a standardized, validated procedure that supports raw material qualification and cGMP compliance under 21 CFR 111.

This assay quantifies methylliberine, the purine alkaloid branded as Dynamine, commonly used in energy, nootropic, and performance supplements. Using HPLC, it verifies methylliberine content to ensure label accuracy, consistent dosing, and safe stimulant formulation.

Samples are extracted using alcohol-based or aqueous solvents and analyzed by HPLC with UV detection at a compound-specific wavelength. Quantification is performed using certified methylliberine standards, with internal standard correction and duplicate injections to ensure precision.

Results are reported in mg per g or per serving. Values are compared to formulation targets and declared label claims to confirm potency and detect mislabeling or improper standardization.

This test identifies and quantifies methylsulfonylmethane (MSM), also known as dimethyl sulfone, in raw materials and finished dietary supplement products using liquid chromatography–tandem mass spectrometry (LC-MS/MS). MSM is a low-molecular-weight organosulfur compound commonly formulated in powders, capsules, tablets, gummies, liquids, and multi-ingredient joint- and mobility-support products. Because MSM is highly water-soluble and has limited chromophoric response for conventional UV detection, LC-MS/MS provides selective detection in the presence of amino acids, sugars, minerals, botanical extracts, flavor systems, and other formulation components. Results are reported as % w/w, mg/g, or mg per serving, according to the product specification and intended label declaration.

A representative sample is accurately weighed and dissolved or extracted in a validated aqueous or aqueous-organic solvent system, typically purified water or a water/methanol mixture, selected to achieve complete recovery of MSM from the relevant dosage form. Solid materials are mixed, sonicated, and/or agitated as necessary; finished matrices may undergo additional clarification steps to remove insoluble excipients and reduce matrix interference. The prepared extract is centrifuged and membrane-filtered before analysis. MSM is separated using a validated chromatographic mode suitable for highly polar analytes, such as hydrophilic-interaction liquid chromatography (HILIC) or a suitably retained reversed-phase method. Detection is performed by tandem mass spectrometry using optimized atmospheric-pressure ionization and compound-specific precursor/product-ion transitions. An isotopically labeled MSM internal standard or a qualified structurally appropriate internal standard may be used to correct for sample-preparation variability and matrix effects. Quantification is performed against a multi-point calibration curve prepared from a qualified, purity-corrected MSM reference standard. Method blanks, system-suitability standards, duplicate preparations, spike-recovery samples, calibration-verification standards, and concurrent quality-control samples are evaluated to confirm selectivity, accuracy, precision, linearity, recovery, and carryover control.

MSM is a small, polar, nonvolatile compound that may be challenging to retain and distinguish from formulation components using non-specific analytical approaches. LC-MS/MS offers high analyte specificity through chromatographic retention, molecular-ion detection, and characteristic fragmentation behavior, enabling reliable MSM quantification even in complex multi-ingredient supplements. The use of an internal standard and matrix-appropriate extraction conditions helps control potential ion-suppression and recovery effects that may otherwise influence results. This method supports raw-material qualification, formulation verification, lot-to-lot consistency, label-claim substantiation, and dietary supplement cGMP quality-control requirements under 21 CFR 111.