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

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Synopsis

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

Gelatin has traditionally been used as a supplement to support hair health, based on the idea that its rich content of collagen and amino acids can strengthen hair and promote growth. Historically, gelatin (derived from animal connective tissue) was consumed in foods like broths, desserts, or as supplements, with the belief that "like supports like"—that is, consuming collagen-rich foods supports the body’s own collagen structures, including hair, skin, and nails.

Some anecdotal reports suggest that regular intake of gelatin can improve hair strength, thickness, and appearance. However, scientific research directly linking gelatin supplementation to enhanced hair health in humans is limited. While gelatin does provide amino acids such as glycine and proline, which are indeed components of keratin (the primary protein in hair), there is insufficient direct evidence to confirm that consuming gelatin translates to measurable improvements in hair growth or quality.

Most contemporary recommendations for gelatin in hair care are rooted in tradition rather than robust clinical evidence. Some small studies and animal research have looked at collagen peptides (similar to gelatin) for skin and nail health, but extrapolation to hair remains uncertain. Thus, while gelatin’s use in hair care persists due to tradition and plausible biological rationale, its effectiveness for this purpose is not well-supported by strong scientific data.

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