Free standard delivery Now Foods NAC - 600 mg

NAC - 600 mg

Name: NAC - 600 mg
Brand: Now Foods
SKU: product-0376
Price: 25.00 GBP
Availability: InStock
Rating: 4.8 (12 reviews)

£25.00

NOW Foods NAC 600 mg is a supplement providing N-acetylcysteine, a stable, acetylated form of the amino acid L-cysteine.

Supports glutathione production to address oxidative stress
May help thin mucous secretions in the respiratory tract
Studied for liver protection, particularly after toxic exposure
May support mood and compulsive behaviour via glutamate pathways
A direct precursor to the body's main endogenous antioxidant

4.8 (12 reflections)

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Now FoodsNAC - 600 mg

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About This Product.

NOW Foods NAC 600 mg is a supplement providing N-acetylcysteine, a stable, acetylated form of the amino acid L-cysteine. Its primary role in the body is as a precursor to glutathione, one of the most important endogenous antioxidants. By replenishing intracellular cysteine, NAC supports the body's capacity to neutralise oxidative stress — a mechanism that has made it a long-standing clinical tool rather than a marketing concept.

NAC is studied for several specific areas. It is widely used to support liver health, particularly in contexts of toxic exposure or heavy alcohol consumption. In the respiratory tract, it acts as a mucolytic, helping to thin and clear mucous secretions; it is used clinically for this reason and is a reasonable consideration for anyone with chronic congestion or chest heaviness. There is also a growing body of research examining NAC's role in mood regulation and compulsive behaviour patterns, via its influence on glutamate signalling in the brain.

This supplement suits people who have identified high oxidative load — through blood markers, lifestyle, or clinical guidance — as well as those supporting liver or lung function. It fits naturally into a morning or early-afternoon routine.

NOW Foods is a well-established supplement manufacturer with a long track record of consistent quality across its product range. At 600 mg per capsule, this delivers a dose in line with the amounts most commonly used in research.

How to Take It

Take 1 capsule one to two times daily, as directed on the packaging. NAC can be taken with or without food, though taking it with a meal may reduce the chance of nausea, which some people notice at first. Avoid taking it late in the evening unless advised otherwise, as some individuals find it stimulating.

Frequently Asked.

What is NAC and how does it differ from L-cysteine?

NAC (N-acetylcysteine) is an acetylated form of the amino acid L-cysteine. The acetyl group makes it more stable and better absorbed than free L-cysteine, and it is more readily used by the body to synthesise glutathione.

Is NAC safe to take alongside other supplements or medications?

NAC is generally well tolerated, but it may interact with certain medications, including nitroglycerin and some chemotherapy agents. If you are on prescription medication or have a diagnosed liver or kidney condition, speak to your GP or a clinician before starting.

How long does it take to notice any difference?

This depends on why you are taking it. For respiratory mucolytic effects, some people notice a change within a few days. For liver or antioxidant support, meaningful changes are more likely over weeks to months — and may be best tracked through repeat blood markers rather than symptoms alone.

Who should avoid NAC?

People with bleeding disorders should exercise caution, as NAC may have mild antiplatelet effects. It is not recommended during pregnancy or breastfeeding without medical supervision. Those with asthma should be aware that, rarely, inhaled forms have triggered bronchospasm — though oral supplementation is generally better tolerated.

Can I take NAC on an empty stomach?

Yes, though some people experience mild nausea when taking it without food. If that occurs, take it with a light meal. The absorption is not significantly affected either way.

Customer Reflections

Overall Sentiment

4.812 reflections

1 – 6 of 12 reflections

Solid daily antioxidant support

5 months ago

Been taking this for about six weeks now, mainly to support my liver after a period of heavier drinking than usual. Hard to quantify exactly what it's doing internally, but I feel less sluggish in the mornings and my skin looks clearer. Take it with breakfast and it fits into my routine without any bother. Good value for what it is.

Does exactly what I needed

5 months ago

Started taking NAC after my GP suggested looking into antioxidant support. This was the brand my nutritionist recommended. Three months in and my chest congestion has noticeably eased — I'd been suffering with it on and off for years.

Good product, wish the capsules were smaller

5 months ago

I've been using this for about two months and genuinely think it's helping with my respiratory stuff — less gunk in the mornings, which is a win. My only gripe is the capsules are quite large and I do struggle to swallow them. Would be great if they offered a smaller cap or a powder option. Otherwise happy with the purchase.

6 months ago

Swapped from a more expensive brand and honestly can't tell the difference. Does what it says at a fraction of the price.

Part of my morning stack

6 months ago

I stack this with vitamin C and alpha lipoic acid — they work well together for antioxidant support. Been doing this for about four months. I noticed I recover better from hard training sessions and don't get that foggy tired feeling I used to get mid-afternoon. Can't ask for much more at this price point.

Effective but the bottle could be bigger

7 months ago

No complaints about the product itself — I take one capsule early afternoon and have noticed a real difference in how my airways feel, particularly in the morning. Only thing is the bottle only lasts about a month and for the size of the supplement habit I've developed, it'd be great to have a larger quantity option. Would save on reordering hassle.

NAC - 600 mg

About This Product.

How to Take It

Frequently Asked.

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