NAC Powder for Antioxidant Support and Glutathione Precursor Formulas

NAC (N-Acetyl L-Cysteine) is the acetylated form of the amino acid L-cysteine, CAS 616-91-1, molecular formula C5H9NO3S, molecular weight 163.19 g/mol. It is used in antioxidant support, liver health, respiratory wellness and detoxification formulas as a direct precursor of glutathione, the body's principal endogenous antioxidant. Purecium supplies NAC as a 99% minimum USP-grade crystalline powder for distributors, contract manufacturers, private-label producers and supplement brands.

Glutathione is a tripeptide of cysteine, glutamate and glycine, and cysteine availability is the rate-limiting factor in its synthesis. NAC supplies cysteine in a stable acetylated form that is well absorbed, supporting glutathione levels and the body's antioxidant defense. Published clinical studies suggest that NAC supplementation supports glutathione status, and this mechanism is recognized by bodies such as the NIH Office of Dietary Supplements.

Free L-cysteine oxidizes readily and is less stable in finished products. N-acetylation protects the thiol group, giving NAC better stability, improved absorption and a longer shelf life, which is why NAC is the standard cysteine form in oral supplement applications. Buyers should verify the assay and related-substance profile on the CoA to confirm oxidative by-products are controlled.

A high-purity NAC should be assayed at 99.0% minimum against the USP-NF monograph, with identification by infrared spectroscopy, related substances and impurities controlled by HPLC (including the cysteine oxidation product L-cystine), loss on drying within limits, heavy metals within limits, conforming residual solvents and microbial counts within USP limits. Purecium reports all of these on the batch Certificate of Analysis.

NAC has a long history of pharmaceutical use as a mucolytic and is covered by USP-NF and European Pharmacopoeia monographs. In the United States, NAC has been sold as a dietary supplement ingredient for decades; note that regulatory treatment differs by market, so buyers should confirm the status of NAC in their destination market before formulation. Typical supplement servings range from 600 mg to 1,800 mg per day, and finished-product claims must follow local regulations.

NAC is used in antioxidant support formulas, liver health and detoxification products, respiratory wellness products, immune support and sports recovery. Its glutathione-precursor mechanism supports phase II detoxification pathways in the liver, and its mucolytic properties are documented in the pharmaceutical literature. Formulators typically pair NAC with glycine, vitamin C, selenium, taurine or milk thistle.

Typical supplement servings of NAC range from 600 mg to 1,800 mg per day, often divided into two doses of 600 mg or 900 mg. Higher intakes are used in specific pharmaceutical contexts. Formulators should set label strength according to destination-market regulations, the finished-product positioning and the supporting evidence base for the intended use.

Yes. NAC is compatible with capsules, tablets, sachets and powder blends. The white crystalline powder has a characteristic sulfurous note that formulators typically manage with encapsulation or flavor masking in powder formats. Particle-size matching and blend uniformity should be verified during formulation, and the finished product should be stored in moisture-protected packaging.

Yes. Purecium's NAC is manufactured by chemical synthesis from L-cysteine, with no animal-derived starting materials or processing aids. It carries a clear vegan, non-GMO, allergen-free and gluten-free statement and is suitable for vegan and vegetarian formulations. Buyers should confirm the cysteine source with their supplier, as some cysteine on the market is derived from animal sources.

Glutathione is the finished tripeptide antioxidant, while NAC is the acetylated cysteine precursor that supports the body's own glutathione synthesis. NAC is generally more stable and cost-effective as a raw material, and its cysteine supply role is the mechanism most consistently supported by published research. Many formulators use NAC plus glycine and glutamine as a glutathione-supporting combination.

NAC acts as a glutathione precursor rather than a direct free-radical scavenger, which differentiates it from vitamin C, vitamin E or polyphenols. Because glutathione is the body's principal endogenous antioxidant, NAC supports the broader antioxidant network. It is commonly combined with vitamin C, selenium and alpha-lipoic acid in comprehensive antioxidant formulas, and with milk thistle in liver-support products.

A professional supplier should provide a current specification sheet, a batch-specific Certificate of Analysis showing identification, assay (99.0% minimum), related substances by HPLC, loss on drying, heavy metals, residual solvents and microbial results, an SDS, allergen and gluten statements, and non-GMO declarations. Also request Kosher and Halal certificates, copies of the ISO 9001 and FSSC 22000 certificates, and stability data for registration purposes. Purecium provides this full documentation set on request for every shipment.

The minimum order quantity is 25 kg. The powder is packed in 25 kg drums with food-grade aluminum-foil inner bags, and samples and technical documentation are available before you commit. Standard production lead time is typically 7 to 15 working days after order confirmation, with faster dispatch for stocked items. For North American customers, Purecium holds inventory at its US warehouse, enabling pickup or delivery within approximately two days. Export documentation is prepared for every shipment.

Store NAC in tightly sealed original containers in a cool, dry place below 25 degrees Celsius, protected from light and moisture. The crystalline powder is stable under these conditions, and shelf life is generally 24 to 36 months from the date of manufacture. Each shipment's CoA states the production date and expiry date for inventory planning.

Purecium supplies NAC as a B2B raw material standardized to 99.0% minimum assay and produced to USP standards by controlled synthesis, with related-substance testing by HPLC on every batch. Every batch is released with a full Certificate of Analysis, an SDS and supporting documentation. The minimum order is 25 kg, inventory is staged at our US warehouse for two-day pickup, and global delivery covers Hong Kong, mainland China, the EU and beyond. For long-term supply relationships, Purecium provides consistent quality, batch traceability, regulatory documents and direct technical communication rather than one-off spot pricing.