Evidence supporting the use of: Collagen
For the health condition: Hair Care (general)

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Synopsis

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

Collagen is a protein that forms a major component of connective tissues, including those found in the skin, hair, and nails. In recent years, collagen supplements have gained popularity for their purported benefits in hair care, with claims that they can improve hair strength, thickness, and growth. Scientific support for collagen’s direct impact on hair health is modest but growing. Some in vitro studies and small human trials suggest that collagen peptides may promote dermal health and potentially improve the condition of the scalp, which can indirectly support hair growth and strength. Collagen contains amino acids such as proline and glycine, which are important building blocks for keratin—the primary protein in hair. However, robust, large-scale clinical trials specifically assessing collagen supplementation for hair outcomes are lacking.

Most existing evidence involves collagen’s role in improving skin elasticity and hydration, which could theoretically benefit the scalp environment. Some small studies and anecdotal reports indicate possible improvements in hair brittleness and growth, but these are not yet strongly validated in the scientific literature. In summary, while there is some scientific rationale and early evidence for collagen supporting general hair health, more high-quality research is needed to confirm its effectiveness. Thus, evidence rating is a 2 out of 5, indicating preliminary but not yet conclusive scientific validation.

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