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

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Table of Contents

Synopsis

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

Sea vegetation, such as seaweed (e.g., kelp, nori, dulse), is sometimes used to support nail health due to its rich content of minerals and vitamins, especially iodine, calcium, magnesium, zinc, and various B-vitamins. Scientifically, these nutrients are recognized as important for maintaining healthy nails. For example, deficiencies in zinc and biotin are known to cause brittle nails or other nail abnormalities. Seaweeds are a natural source of these nutrients, and thus their inclusion in the diet could theoretically help prevent or address deficiencies that negatively impact nail health.

However, direct scientific studies specifically examining the effects of sea vegetation supplementation on human nail health are limited. Most evidence is extrapolated from general nutrition science and the known nutrient profile of seaweeds. There is some support in the literature for the use of seaweed extracts in cosmetic formulations for nails due to their mineral content, but robust clinical trials in this area are lacking. Additionally, excessive iodine intake from seaweed can potentially cause thyroid issues, which can in turn affect nail health negatively.

In summary, while there is a scientific rationale based on the nutrient content of sea vegetation, direct evidence supporting its use for nail health is limited. The evidence rating is therefore moderate to low (2/5), reflecting the gap between theoretical benefit and proven clinical outcomes.

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