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Did you mean L-cystine?

Glossary L-cystine

amino acid formed by linking two cysteine molecules

L-cystine is an amino acid that forms when two molecules of cysteine, another amino acid, are linked by a disulfide bond. It plays a crucial role in the structure and strength of hair, skin, and nails by contributing to the formation of keratin, a key structural protein.

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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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Research

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research Effects of the Usage of l-Cysteine (l-Cys) on Human Health

75 citations , March 2018 in “Molecules/Molecules online/Molecules annual”

This review discusses the potential health benefits of L-Cysteine, noting increased research interest but highlighting a lack of clinical trial data for consensus on its effectiveness.

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 Reduction mechanism of L‐cysteine on keratin fibers using microspectrophotometry and Raman spectroscopy

29 citations , August 2005 in “Biopolymers”

In this study, researchers found that L-cysteine interacted electrostatically with anionic ions on the surface of keratin fibers in human hair, reducing the rate of disulfide bond disconnection at pH 9.0.

Action of Thioglycolic Acid and L-Cysteine on Disulfide Cross-Links in Hair Fibers During Permanent Waving Treatment

research Action of Thioglycolic Acid and L-Cysteine to Disulfide Cross-Links in Hair Fibers during Permanent Waving Treatment

18 citations , January 2008 in “Sen'i Gakkaishi”

This study observed that repeated perm treatments decrease disulfide bonds in hair due to their conversion largely into cysteic acid, affecting the waving efficiency depending on the reduction agent used.

research Study on modification of rabbit hair fibers with L-cysteine

2 citations , December 2019 in “Textile Research Journal”

This study found that L-cystine-modified rabbit hair fibers had improved dye adsorption and spinnability, due to changes in secondary structure and surface characteristics.

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Community Join

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community Protein's role in hair growth is more nuanced than just quantity

in Technology 5 upvotes 4 months ago

Protein's role in hair growth is complex, with specific amino acids like cysteine being crucial for effective hair growth. Users discussed using l-cysteine supplements, noting reduced hair loss and faster growth, though some experienced digestive issues.

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 Fighting Hair loss AND Grey Hair

2 upvotes 4 years ago

OP is exploring ways to stop or reverse greying hair, using NAC and considering PABA supplements. Some users suggest hair dye, black strap molasses, and copper as potential solutions.

community Supplements regime/suggestions

4 upvotes 8 years ago

The conversation discusses hair loss treatments, including finasteride, pumpkin seed oil, castor oil, fish oil, and various supplements like NAC, glycine, and vitamin C. Opinions vary on the effectiveness of these treatments, with some users skeptical about their impact on hair loss.

community Thoughts on my dermatologist only giving me methionine for AGA?

5 upvotes 4 years ago

A dermatologist prescribed methionine with vitamins for hair loss, but the user is doubtful and plans to seek finasteride in France. The user is unsure why finasteride or minoxidil wasn't prescribed, suspecting concerns about side effects or strength.

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