Evidence supporting the use of: Sea vegetation (unspecified)
For the health condition: Hair (loss or thinning)

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Synopsis

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

Sea vegetation, such as various types of seaweed, has a long history of traditional use in hair care, particularly in East Asian cultures. Seaweed is rich in minerals (like iodine, zinc, and iron), vitamins (especially B vitamins), and polysaccharides, all of which are believed to contribute to scalp health and possibly hair growth. In traditional practices, seaweed extracts or infusions have been applied to the scalp, incorporated into shampoos, or consumed in the diet with the belief that they strengthen hair, promote growth, and prevent thinning.

However, scientific validation for these claims remains limited. While some in vitro (test tube) studies have demonstrated that extracts from certain seaweeds may promote the proliferation of dermal papilla cells (which are involved in hair follicle function), there is a lack of robust clinical trials demonstrating significant effects on hair loss or thinning in humans. Some seaweed components, like fucoidan and laminaria, have shown antioxidant and anti-inflammatory properties that could theoretically benefit scalp health, but direct evidence linking seaweed use to reduced hair loss is minimal.

Overall, the use of sea vegetation for hair loss or thinning is primarily justified by traditional use rather than strong scientific evidence.

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