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Glossary Cystine

amino acid formed by linking two cysteine molecules

Cystine is an amino acid that forms when two cysteine molecules are linked by a disulfide bond. It is important for the structural stability of proteins, particularly in keratin, which is a key component of hair, skin, and nails. This bond helps maintain the strength and rigidity of these proteins, contributing to the overall health and resilience of hair and other tissues.

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learn L-cysteine

What is L-cysteine, and why is it often included in hair growth supplements? L-cysteine supports hair growth by strengthening keratin, the main protein in hair.
Can taking L-cysteine orally really strengthen hair from the inside? L-cysteine may help strengthen hair if there's a deficiency, but results vary.
Does L-cysteine work better alone or when combined with other vitamins and minerals? L-cysteine works better when combined with vitamins and minerals for optimal hair health.
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learn acetyl cysteine

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Research

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research Chemoprevention of smoke-induced alopecia in mice by oral administration of l-cystine and vitamin B6

41 citations , March 2007 in “Journal of dermatological science”

This study found that oral administration of l-cystine with vitamin B6 effectively prevents environmental cigarette smoke-induced alopecia in mice by reducing hair bulb cell apoptosis.

research Cysteine Prevents the Reduction in Keratin Synthesis Induced by Iron Deficiency in Human Keratinocytes

40 citations , July 2015 in “Journal of Cellular Biochemistry”

This study found that cysteine supplementation significantly increases keratin expression in human keratinocytes, and counteracts the negative impact of iron deficiency on keratin production by enhancing iron availability for cellular processes.

research Ultrastructural Localization of S100A3, a Cysteine-rich, Calcium Binding Protein, in Human Scalp Hair Shafts Revealed by Rapid-freezing Immunocytochemistry

40 citations , April 1999 in “Journal of Histochemistry & Cytochemistry”

In this study, the researchers identified the specific subcellular localization of the protein S100A3 in the endocuticle and cortex of human hair shafts.

research [Low dosage retinol and L-cystine combination improve alopecia of the diffuse type following long-term oral administration].

16 citations , August 1989 in “PubMed”

This study concluded that high-dose oral therapy with L-cystine, gelatin, and vitamin A significantly improved hair growth indicators in patients with diffuse hair loss, with no systemic side effects observed.

research Cystine-thiamin-containing hair-growth formulation modulates the response to UV radiation in an in vitro model for growth-limiting conditions of human keratinocytes

9 citations , September 2018 in “Journal of Photochemistry and Photobiology B-biology”

This study demonstrated that combining l-cystine and thiamin in a formulation may protect against UV-induced damage in growth-limited human epidermal keratinocytes in vitro.

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Community Join

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community Any clinical study on cysteine alone for hair loss?

6 upvotes 1 year ago

The conversation discusses the lack of clinical studies on cysteine alone for hair loss, with the original poster already using medications like Minoxidil and finasteride. Suggestions include trying 2ddr as a growth stimulant, though concerns about side effects like gas are mentioned.

community Efficacy and Tolerability of N-Acetyl-Cysteine for Treatment of The Early-onset Androgenetic Alopecia in Men

26 upvotes 4 years ago

N-Acetyl-Cysteine (NAC) was found to improve hair parameters in men with early-onset androgenetic alopecia, showing increased terminal hair count and decreased vellus hair count, with good tolerability. NAC, used alone or with minoxidil, may help due to its antioxidant properties, though its effectiveness can vary among individuals.

community Clinical Trial: N-Acetyl-Cysteine for Treatment of AGA in Men

5 upvotes 5 years ago

N-Acetyl-Cysteine (NAC) is being explored for treating hair loss, but users report mixed results. Some also mention using Quercetin and Resveratrol without significant hair improvement.

community Let Me Sell You on NAC

17 upvotes 7 years ago

The conversation discusses using NAC (N-Acetyl Cysteine) alongside minoxidil and finasteride for hair loss, with some users noting potential hairline improvement and increased energy. The original poster reduced their finasteride dosage due to mental decline and anxiety, and while NAC's effects on hair are anecdotal, it is considered low-risk with other health benefits.

community This may be common news to some, but I’ve just learned the importance of amino acids for hair growth / strength.

7 upvotes 3 years ago

Amino acids, particularly Cysteine, are important for hair growth and may be lacking in a normal diet. Using a protein powder that includes these amino acids can help improve hair growth and strength.

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