Synopsis

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

Fish protein, particularly in the form of collagen peptides derived from fish skin and scales, has been studied for its potential benefits to nail health. Collagen is a key structural protein in the body and contributes to the strength and resilience of nails. Some clinical studies suggest that supplementation with hydrolyzed collagen (including marine or fish-based sources) can improve nail growth rate and reduce brittleness. For example, a few small, placebo-controlled trials have shown modest improvements in nail brittleness and increased nail growth after several months of daily collagen supplementation.

However, the scientific evidence supporting the use of fish protein specifically for nail health is limited and not robust. Most studies focus on collagen peptides in general, and only a subset use fish-derived collagen. The mechanisms proposed involve providing amino acids like glycine and proline that are essential for keratin (the main protein in nails) synthesis. Still, well-controlled, large-scale trials are lacking, and the direct impact of fish protein or collagen supplementation on nail health remains only moderately supported. There is also a lack of consensus on optimal dosage and long-term effects.

In summary, while there is emerging scientific evidence supporting a role for fish protein (mainly as collagen peptides) in supporting nail health, the quality and quantity of the evidence are moderate at best, warranting a rating of 2 out of 5.

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