Evidence supporting the use of: Fish (including shell)
For the body system: Hair

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Synopsis

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

Fish, including certain shellfish, is scientifically supported as beneficial for the hair (and broadly, the integumentary) system. The primary reason is its rich content of omega-3 fatty acids, high-quality protein, vitamins (notably vitamin D and B vitamins), and essential trace minerals such as selenium and zinc. Multiple studies indicate that omega-3 fatty acids, prevalent in fatty fish like salmon, mackerel, and sardines, can help reduce inflammation, support scalp health, and may promote hair growth or reduce hair loss by improving follicle circulation and cellular metabolism. Protein from fish is integral for keratin production, the structural component of hair. Deficiencies in dietary protein or certain micronutrients (like zinc, found in shellfish such as oysters) are linked to hair thinning or loss. Randomized controlled trials and reviews suggest that supplementation with fish oil or increased dietary fish intake can improve hair density and reduce telogen effluvium (diffuse hair shedding) in some populations, especially those with pre-existing nutritional deficiencies. However, while the evidence is robust for fish as a source of these nutrients, direct trials on fish or shellfish alone as hair treatments are limited; benefits are generally inferred from the roles of their constituent nutrients. Thus, fish consumption is scientifically validated as supportive for hair health, mainly as part of a balanced diet rather than as a targeted therapy.

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