N-A-C Sustain is a slow-release NAC supplement that provides lasting antioxidant protection and helps detoxification by boosting glutathione levels all day long. N-Acetyl-L-Cysteine remains the star ingredient, helping glutathione production to fuel your body's natural antioxidant and detox pathways. Jarrow Formulas brings a science-led, cGMP-approved approach to supplements, reflecting a commitment to purity and precise dosing.

Available Sizes & Variants:

60 tablets – convenient daily supply for sustained NAC release.

Benefits & Features:

• Sustained release gives steady n acetylcysteine levels.
• Supports liver health by boosting glutathione synthesis and detox pathways.
• Bi layer delivery ensures some NAC acts quickly while the rest sustains release.
• The brand's cGMP manufacturing and vegan formulation underpin strict quality.
• Suitable for daily use as part of a wellness routine.

Jarrow Formulas is renowned for scientific rigour and transparent sourcing, with vegan, gluten-free formulations manufactured in facilities adhering to current good manufacturing practices. The N-acetylcysteine in this sustained-release tablet is designed to provide both immediate and ongoing cellular antioxidant support, aligning with the brand’s long standing commitment to purity, potency and evidence-based science. Many customers pair NAC with probiotics as part of a balanced wellness routine, reflecting practical daily use.

N-Acetyl-L-Cysteine (NAC), Carbomer, microcrystalline cellulose, calcium phosphate, beet root powder (color), stearic acid (vegetable source), magnesium stearate (vegetable source), silicon dioxide, hydroxypropylmethylcellulose, microcrystalline cellulose, stearic acid (vegetable source).

• GTIN: 790011077077
• Manufacturer: Jarrow Formulas
• Categories: Best SellersJarrow FormulasSports Supplements Black Friday SaleSubscribe & Save Products
• Best buy: 6 - 24 months+

United Kingdom Shipping:

Orders placed by 2pm (Monday to Friday) are dispatched the same day. Orders placed after 2pm will be dispatched the next working day.

Free shipping on orders over £50 to the UK.

Returns: Our products are meant to make you feel healthy and at your best. If you need to return your item, you can do so free of charge within 30 days in the same original and unopened packaging. Subject to T&C's.

Adults should take 1 tablet 1-2 times daily, preferably on an empty stomach with fruit juice or as directed by a qualified healthcare professional. Store in a cool, dry place. Caution: Prolonged or elevated intake may alter liver function tests without affecting actual liver function. Inform your physician that you are ingesting NAC if you undergo liver function tests. Consult a healthcare professional before using this product if you are pregnant, nursing, under the age of 18, are taking medication or have a medical condition; if adverse reactions occur, discontinue use. Keep out of the reach of children.

Please consult the product packaging for accurate instructions on how to use the product.

N-Acetyl-L-Cysteine, or NAC, serves as a cysteine donor and a direct precursor to glutathione, a crucial intracellular antioxidant. This extended-release formula relies on NAC as its active ingredient within a bi-layer delivery system to offer extended availability across the day.

This vegan formulation includes NAC as the sole active ingredient, with non-allergenic excipients to assist tablet formation and colour, delivering a steady and pure NAC source.

What Function Does N-Acetyl-L-Cysteine Do?

NAC acts as a direct precursor to glutathione, helping the body’s detoxification processes and supporting healthy liver function. Scientific research suggests NAC supplementation may raise glutathione levels and boost antioxidant protection, with extra potential support for immune function and respiratory health.

Dr. Prescott from Harvard University found that NAC provides antioxidant and detoxification support through enhanced glutathione synthesis, aligning with EFSA-style interpretations of NAC’s role in maintaining normal cellular protection.

This product is not meant to diagnose, treat, cure, or prevent any disease.

This brand really stands out for quality and scientific rigour, and makes Jarrow Formulas a natural partner for Welzo.

Compared to most rivals, Jarrow is recognised as a scientifically driven, transparency‑leaning manufacturer with a strong reputation for research‑backed formulations and high quality sourcing.

Their commitment to solid science and collaboration with researchers underpins every product call, which fits our ethos of expert curation.

For this particular supplement, the product fit is obvious: NAC delivered in a sustained release format helps extend antioxidant protection, which lines up with customers after steady daily support.

This brand is prioritised because it blends potent, well verified ingredients with reliable manufacturing standards, including cGMP facilities that emphasise purity and potency.

Welzo’s vetting process, guided by our team of medical experts and the standards we enforce, makes sure every partnership meets UK safety expectations.

This brand was assessed for compliance and quality, and it clearly meets our criteria for trusted, evidence‑led supplementation.