N-acetyl Cysteine (NAC) is the more stable form of the amino acid L-Cysteine due to the additional acetyl molecule attached. L-Cysteine can directly participate in glutathione synthesis, whereas N-acetyl-L-cysteine must be first de-acetylated (i.e., broken down) before its incorporation to glutathione. Cell studies have shown L-Cysteine to be more effective in increasing cellular antioxidant glutathione levels. However, L-Cysteine is less stable than NAC so oxidizes more readily in the body. To help prevent or slow this process, 3x more ascorbic acid (vitamin C) should be consumed. So for every 1g L-Cysteine consider taking 3 g Vitamin C.

I read an article about a new study saying this will cure hangovers. Thoughts?

I read that article and bought a bottle to try. It works! Absolutely amazing hangover cure that actually works. I get hangovers from just 2 glasses of beer normally and now I get virtually none. I just take 2 tablets each time I drink and may take another if I go hard. If I drink too much and forget to take a 3rd tablet, I may have a very mild headache the next day, which is much improved from being out for the count all day like I used be after drinking. My boyfriend and roommate can also attest and ask me for some whenever we have some drinks together. All I can say is, just try it. You'll be amazed.

Is it made of human hair? If surprised read about L cysteine or E920(another name) on internet

Apparently synthetic L-Cysteine is expensive to manufacture, so human hair, duck feathers and pigs' bristles can be used. Whether NOW's L-Cysteine is a product of human hair it is not clear.

Is this product vegan?

It is most commonly derived from human hair.

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💥 Unlock your natural glow with every tablet!

TRIPLE BEAUTY BOOST - Enhances skin elasticity, strengthens hair, and fortifies nails for a polished, professional look.
POWER PACKED 500 MG DOSE - Maximize your daily amino acid intake with a clinically effective 500 mg of L-Cysteine per tablet.
VITAMIN B 6 C INFUSION - Synergistic vitamins amplify absorption and overall wellness benefits.
COLLAGEN PROTEIN SUPPORT - Promotes collagen synthesis and stabilizes protein structures to maintain youthful vitality.
CLEAN ALLERGEN FREE FORMULA - Pure, non-essential amino acid supplement with zero allergens—perfect for mindful health enthusiasts.

NOW Foods L-Cysteine delivers a potent 500 mg dose of this key amino acid, essential for collagen production and keratin structure. Enhanced with Vitamins B-6 and C, it supports healthy skin, hair, and nails while being allergen-free and designed for adult daily use.

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