Evidence supporting the use of: Fish oil
For the body system: Hair

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Synopsis

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

Fish oil, which is rich in omega-3 fatty acids (notably EPA and DHA), is commonly marketed for supporting hair health. There is some scientific basis for this association, though the evidence is limited. Omega-3 fatty acids have anti-inflammatory properties and play a role in cell membrane function, which could theoretically benefit hair follicles. Some small-scale studies and animal models suggest that supplementation with fish oil may improve hair density and reduce hair loss, potentially by promoting circulation to the scalp and reducing inflammation that can contribute to hair thinning. For example, a 2015 randomized controlled trial found that a marine protein supplement containing fish oil led to increased hair growth in women with self-perceived thinning hair. However, such studies often use multi-ingredient supplements, making it difficult to isolate the effect of fish oil itself.

There is a lack of large, well-controlled clinical trials directly linking fish oil supplementation to significant improvements in human hair health. Overall, while fish oil may have a modest benefit for hair due to its anti-inflammatory and cell-nourishing properties, the current scientific evidence is not strong. Most authoritative reviews conclude that more research is needed before definitive claims can be made.

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