Evidence supporting the use of: Sea vegetation (unspecified)
For the body system: Hair

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Synopsis

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

Sea vegetation, such as various species of seaweed (including kelp, nori, wakame, and others), is sometimes promoted for hair health due to its rich nutrient profile, particularly its high levels of iodine, vitamins (A, C, E, and some B vitamins), minerals (zinc, iron, selenium), and antioxidants. Scientifically, there is limited direct evidence linking the consumption or topical application of sea vegetation to improvements in hair growth or hair quality in humans. Some studies have shown that certain nutrients found abundantly in seaweed are essential for healthy hair; for example, deficiencies in zinc, iron, or iodine can lead to hair thinning or loss. However, these findings are not specific to sea vegetation, but rather to general nutrient sufficiency.

A few small studies and anecdotal reports suggest that extracts from seaweed may have beneficial effects on scalp health or hair strength, often attributed to bioactive compounds such as fucoidan or phlorotannins. However, these studies are preliminary, mostly in vitro or animal studies, and not robustly validated in large human trials. Overall, while the nutritional content of sea vegetation theoretically supports hair health, direct scientific evidence for its specific use for this purpose remains limited and weak, justifying a modest evidence rating.

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