Evidence supporting the use of: Amino Acid (unspecified)
For the health condition: Hair (loss or thinning)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Amino acids are the building blocks of proteins, which are essential components of hair structure. Hair is primarily made of keratin, a protein formed from various amino acids. Several studies have explored the role of both essential and non-essential amino acids in hair growth and health. For example, deficiencies in certain amino acids—such as cysteine, methionine, and lysine—have been linked to hair thinning and loss. Supplementation with specific amino acids has been shown to support hair growth in individuals with poor dietary intake or certain medical conditions affecting protein metabolism. However, when it comes to "unspecified" amino acids or general amino acid supplementation, the evidence is less robust. Clinical trials investigating mixtures of amino acids have demonstrated modest improvements in hair density and thickness, primarily in subjects with malnutrition or underlying amino acid deficiencies. There is limited evidence to support the use of amino acid supplements for hair loss in healthy individuals without deficiencies. Overall, while there is a sound biological rationale and some scientific support, particularly in deficiency states, the evidence for broad use of "unspecified" amino acids for hair loss or thinning is moderate and not universally conclusive.

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