N-Acetyl-L-Cysteine (NAC) – Allergy Research Group

N-Acetyl-L-Cysteine (NAC) – Allergy Research Group


How to order

1. Only registered nutritionists such as myself can supply ARG supplements. Your 1st order needs to be placed by phone with the UK’s official distributor, Nutri-Link. Call them on 0333 577 0404 and provide them with my name, Matt Janes, as your registered nutritionist.

2. For subsequent orders, you can order online from their website (link), since they will set up an account for you.

For details about Allergy Research Group N-Acetyl-L-Cysteine (NAC), scroll down the page.

Call 0333 577 0404


Allergy Research Group NAC (N-Acetyl-L-Cysteine) – 120 capsules x 500mg.

NAC is the precursor to glutathione, the body’s main antioxidant, as well as playing a critical role for a healthy metabolism. As the acetyl derivative of L-cysteine, NAC is more stable than L-cysteine, and can convert into L-cysteine after being absorbed. NAC is a free-form amino acid, high purity, well tolerated, and in tablet form to insure potency.

N-Acetyl-L-Cysteine (NAC) is the body’s primary antioxidant, antitoxin, and immune support nutrient. NAC is a derivative of the amino acid L-cysteine, and is a dietary precursor to reduced glutathione. Glutathione, cysteine, and NAC are sulphydryl (-SH) substances, which play crucial roles in the body’s natural antioxidant defences.

Antioxidant activity is important to homeostasis and to normal metabolism. NAC has superior bioavailability compared to glutathione and cysteine. As potent antioxidant free radical scavengers, the natural sulphydryl (-SH) substances can readily donate electrons, which makes them able to combine with, and thereby neutralise, a great variety of potentially toxic, reactive substances.

These -SH substances can also help protect against radiation damage, which is largely mediated by free radical formation. They are important physiological antitoxins, and are valuable for optimal immune function.

As a precursor to glutathione (GSH), NAC is an excellent biochemical resource for aiding detoxification of environmental toxins (xenobiotics). It may contribute by supporting the mercury, lead and cadmium clearance from the body, NAC may help to buffer these heavy metals.

Reduced glutathione has long been recognised to play an essential role in immune function, especially via its antioxidant/reducing properties.

GSH may contribute to lower mucus viscosity, so that the lungs may be cleared more easily.

GSH levels in the various organs can decline with age, and NAC may contribute to the amelioration of GSH deficiencies related to aging.

Oral supplementation with glutathione appears not to be the best means for repleting the body’s glutathione levels, since it is largely broken down by intestinal enzymes and comparatively little is absorbed intact. NAC, on the other hand, appears to be an excellent dietary starting substance for building up reduced glutathione.

NAC is well tolerated and well absorbed, and is also more stable than its non-acetylated relative L-cysteine, which has a tendency to “auto-oxidise” (break down spontaneously within the gut and body).


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