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

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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 in the skin, hair, and nails. The rationale for using collagen supplements to support or treat hair loss or thinning is rooted in its role in providing structure and strength to the skin beneath the hair (the scalp) and in the hair follicle environment. Some proponents also note that collagen contains amino acids that are building blocks for keratin, the protein that makes up hair.

However, scientific evidence supporting the direct effectiveness of collagen supplementation for preventing or treating hair loss is limited. Most available studies are small, non-randomized, or funded by supplement manufacturers. A few small trials and anecdotal reports suggest improvements in hair thickness, shine, and growth when collagen is consumed, often as part of a broader supplement mix. However, these results are generally modest and not consistently replicated in rigorous, peer-reviewed clinical trials.

There is stronger evidence that collagen may improve skin elasticity and hydration, indirectly supporting a healthy scalp environment. Still, direct evidence for hair growth or reduced hair loss is weak. The best-supported interventions for hair loss remain medications such as minoxidil or finasteride, or addressing underlying health or nutritional deficiencies.

In summary, while there is some scientific rationale and preliminary evidence for collagen supplementation in supporting hair health, the quality and quantity of evidence remain low (rated 2/5). More robust, independent clinical trials are needed.

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