Evidence supporting the use of: Cysteine
For the health condition: Hair (loss or thinning)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Cysteine is a semi-essential amino acid and a key constituent of keratin, the structural protein that makes up hair. Its use in supporting hair health, and particularly in addressing hair loss or thinning, is based on its biochemical role in hair structure.

There is some scientific rationale for cysteine supplementation because cysteine is rich in sulfur bonds, which provide strength and rigidity to hair. Laboratory and animal studies have shown that cysteine is important for keratin production and hair shaft integrity. Additionally, some clinical studies involving supplements like N-acetylcysteine (NAC) or L-cystine (a dimer form of cysteine) in combination with other nutrients (such as B vitamins and millet extract) suggest modest benefit in improving hair growth or reducing hair shedding in individuals with diffuse hair loss. However, these studies often use combination products, making it difficult to isolate the effects of cysteine itself.

Overall, while the biological plausibility for cysteine supporting hair structure is clear, direct clinical evidence for its efficacy in treating hair loss or thinning is limited and mixed. The rating of 2 reflects the existence of some scientific studies and plausible mechanistic explanations, but the lack of strong, high-quality, and consistent clinical trial data specifically for cysteine alone.

More about Cysteine
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Products containing Cysteine

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