Jarrow Formulas N-A-C Sustain

Jarrow Formulas N-A-C Sustain is a bilayer tablet supplement delivering N-Acetyl-L-Cysteine (NAC) in a unique Quick Release / Sustained Release format. It provides both immediate and extended antioxidant support through NAC — a powerful amino acid and precursor to the critical antioxidant glutathione.

NAC (N-Acetyl-L-Cysteine) is a stable form of the amino acid L-cysteine and a direct precursor to glutathione, the body’s primary intracellular antioxidant. It supports detoxification, oxidative stress defence, and overall cellular health.

The Sustain bilayer format consists of two layers in a single tablet: a Quick Release layer that delivers NAC rapidly for immediate antioxidant support, and a Sustained Release layer that provides a prolonged release of NAC over time — ensuring consistent coverage throughout the day from a single serving.

Glutathione is the body’s most important intracellular antioxidant, responsible for detoxification, immune function, and defence against oxidative stress. The body requires cysteine to synthesise glutathione, and NAC is the most efficient supplemental source of this precursor.

Key benefits include replenishment of glutathione precursors, broad antioxidant defence, support for liver detoxification pathways, protection against oxidative stress from training or environmental exposure, and defence against substances that deplete glutathione, such as alcohol and acetaminophen.

N-A-C Sustain is designed for athletes, bodybuilders, and health-conscious individuals who want liver and antioxidant support — particularly those on demanding supplementation protocols or who are exposed to substances that reduce glutathione, such as alcohol or certain medications.

Follow the dosage instructions on the label. The bilayer tablet format is designed to be taken once or twice daily without crushing, to preserve the sustained release mechanism. It can be taken with or without food.

Yes. N-A-C Sustain is a safe and well-studied antioxidant supplement suitable for a wide range of users, including beginners. It is a valuable foundational supplement for anyone seeking liver, detoxification, and antioxidant support.

Yes. NAC is commonly included in on-cycle and post-cycle support stacks, alongside liver support supplements such as TUDCA and Milk Thistle. It also pairs well with general wellness protocols, antioxidant stacks, and performance-focused supplementation routines.

Jarrow Formulas N-A-C Sustain is available through Cross The Limits, an authorised UK retailer. Orders placed before 4pm are dispatched the same day, with free UK shipping on orders over £89.