Evidence supporting the use of: Amino Acid (unspecified)
For the body system: Hair

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Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Amino acids are the building blocks of proteins, which are essential for the structure and growth of hair. Hair is primarily composed of a protein called keratin, which is itself made up of various amino acids, including cysteine, methionine, lysine, and others. Scientific research supports the idea that adequate dietary intake of essential amino acids is necessary for healthy hair growth and maintenance. Deficiencies in protein or specific amino acids can lead to hair thinning, shedding, or impaired hair growth.

Several clinical studies have investigated the effects of amino acid supplementation on hair health. For example, a 2018 review published in the journal Dermatology and Therapy highlights that amino acids, especially sulfur-containing ones like cysteine and methionine, play a crucial role in keratin synthesis and the overall structural integrity of hair. Some studies have shown that supplementation with specific amino acids, often in combination with other nutrients, can improve hair strength, thickness, and growth in individuals with deficiencies or certain types of hair loss.

However, while the scientific rationale is strong, direct evidence from large-scale randomized controlled trials focusing solely on "amino acid (unspecified)" supplementation for individuals without deficiencies is limited. Most benefits are observed in the context of overall nutritional support or in populations with inadequate protein intake. In summary, scientific evidence supports the role of amino acids in hair health, particularly as part of a balanced diet or when addressing deficiencies.

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