Pack size: 100 capsules

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N-A-C 500

N-acetyl-L-cysteine

68,99 zł

Pure N-acetyl-L-cysteine in a simple formula
Provides a source of cysteine used to make glutathione
Fits a considered approach to oxidative balance

Overview

One well-characterized ingredient, in a simple formula. N-acetyl-L-cysteine (NAC) is an acetylated form of cysteine, a sulfur-containing amino acid the body uses to produce glutathione. This relationship has made NAC a long-standing subject of research on oxidative balance.

At the heart of the formula / N-A-C 500

Thoughtful support. Clear purpose.

01Pure N-acetyl-L-cysteine in a simple formula
02Provides a source of cysteine used to make glutathione
03Fits a considered approach to oxidative balance
04An ingredient examined in a broad range of human clinical studies
05A simple formula that is easy to fit into your supplement routine
06A pullulan capsule shell, made without gelatin
07For those who prefer NAC as a standalone ingredient

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N-A-C 500

Made for your daily routine.

N-A-C 500 keeps NAC as its only active ingredient. A clear formula makes it easier to track intake and avoid duplicating ingredients from other products.

NAC has a long history of human research. Trials and meta-analyses have examined glutathione and oxidative markers, although responses depend on the amount and participants' starting status.

The product uses a pullulan capsule and is intended for adults. Take it with a meal and follow the label's hydration advice.

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N-A-C 500

Why does NAC matter?

Glutathione is made from glutamate, glycine, and cysteine. Cysteine availability can limit its production. NAC is a cysteine derivative that can supply this precursor through metabolism.

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N-A-C 500

What research informs N-A-C 500?

A meta-analysis of 26 controlled studies reported changes in glutathione and antioxidant measures with NAC. Other human trials have examined oxidative markers. Some used 600 mg daily, whereas this capsule provides 500 mg; similar amounts do not establish equivalent results.

Ingredients / Doctor Life

Every ingredient. Clearly explained.

Each ingredient, its form and quantity — in one place.

Ingredient amounts for the servings shown in the table.
Ingredient	1 capsule
N-acetyl-L-cysteine (NAC)	500 mg

*NRV: Nutrient Reference Value

Full ingredient list

N-acetyl-L-cysteine; capsule shell: pullulan (bulking agent).

How to use

Part of your daily rhythm.

How to use

Adults: Take 1 capsule daily with a meal.

Important information

Do not exceed the recommended daily serving. Food supplements should not replace a varied diet. A balanced diet and healthy lifestyle are recommended. Not intended for use during pregnancy or breastfeeding. Drink 6–8 glasses of water daily while taking NAC. Store at room temperature, no higher than 25°C, out of reach of young children.

Science & sources

Understand the formula.

NAC is widely studied as a source of cysteine in research on glutathione and oxidative balance. These publications examine its effects on glutathione levels, total antioxidant capacity, and markers of oxidative stress in humans.

These publications concern the studied ingredients or formulas. They do not all evaluate the finished Doctor Life product, and research results do not guarantee individual outcomes.

01N-acetylecysteine, a powerful agent in the reinforcement of anti-oxidant profile: A systematic review and dose-response meta-analysis of controlled clinical trials

Mahsa Mahmoudinezhad, Fatemeh Abbaszadeh, Meysam Zarezadeh, Nazgol Bahreini, Parsa Jamilian, Parmida Jamilian, Alireza Ostadrahimi

Clinical Nutrition ESPEN (2023), 54, 227-238. DOI: 10.1016/j.clnesp.2023.01.021; PMID: 36963867.

A meta-analysis of 26 controlled clinical trials associated NAC supplementation with significant increases in glutathione (GSH) and total antioxidant capacity (TAC). These findings provide human evidence for NAC’s role as a glutathione precursor; the studies did not test this finished product.

Read publication ↗

02Modulatory effect of N-acetylcysteine on pro-antioxidant status and haematological response in healthy men

Agnieszka Zembroń-Łacny, Małgorzata Słowińska-Lisowska, Zbigniew Szyguła, Z. Witkowski, K. Szyszka

Journal of Physiology and Biochemistry (2010), 66(1), 15-21. DOI: 10.1007/s13105-010-0002-1; PMID: 20354834.

In a study of healthy men, eight days of oral NAC increased glutathione levels by 31% and reduced selected markers of oxidative damage by more than 30%. The findings concern the dose, population, and conditions studied.

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03Neutrophil function and glutathione-peroxidase (GSH-px) activity in healthy individuals after treatment with N-acetyl-L-cysteine

T. Urban, B. Akerlund, C. Jarstrand, B. Lindeke

Biomedicine & Pharmacotherapy (1997), 51(9), 388-390. DOI: 10.1016/S0753-3322(97)89431-0; PMID: 9452788.

Healthy participants took 600 mg of NAC daily for two weeks, compared with 500 mg in one Doctor Life capsule. Researchers observed increased glutathione peroxidase activity and changes in neutrophil oxidative responses. The difference in dose and preparation means the findings cannot be assumed to apply directly to this product.

Read publication ↗

FAQ / N-A-C 500

Good questions. Clear answers.

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How does NAC differ from taking glutathione?

NAC supplies a cysteine precursor that the body can use to make glutathione. Glutathione supplements supply the compound itself. They are different approaches, and neither is universally preferable.

How does 500 mg compare with amounts used in research?

Studies use a wide range of amounts, including 600 mg daily and larger servings. This capsule provides 500 mg. Results from other amounts should not automatically be applied to it.

Is NAC simply another antioxidant?

Its defining role is as a source of cysteine for glutathione synthesis. Research therefore often measures glutathione status as well as oxidative markers.

Should I take NAC on an empty stomach?

Follow this product's directions: one capsule daily with a meal.

Why does the label recommend six to eight glasses of water daily?

This is part of the product's hydration guidance. If you have a medically prescribed fluid restriction, ask your clinician how to follow it before use.

Has NAC been studied in active adults?

Yes. Exercise studies have examined redox balance and performance, with responses sometimes depending on initial glutathione status. It should not be treated as a universal performance booster.

What is useful about the single-ingredient formula?

N-A-C 500 provides one active ingredient, with a pullulan capsule shell. This makes the NAC amount clear and avoids adding unrelated vitamins, minerals, or botanicals.

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