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

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Synopsis

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

Kelp, a type of seaweed, has traditionally been used in various cultures as a dietary supplement due to its rich nutrient profile, particularly its high iodine content and presence of trace minerals. The use of kelp for supporting nail health is primarily grounded in traditional and anecdotal practices rather than robust scientific evidence. Nails require sufficient intake of certain minerals—such as zinc, iron, and selenium—as well as vitamins for optimal growth and strength. Kelp does contain small amounts of these nutrients, and its historical use as a tonic for general vitality and hair and nail strength is well-documented in traditional medicine systems, especially in East Asia.

However, there is limited direct scientific research specifically linking kelp consumption to improved nail health. Most of the rationale is extrapolated from the general benefits of adequate micronutrient intake. Some observational reports suggest that correcting iodine deficiency (which kelp may assist with) can indirectly benefit nail health, but these effects are not unique to kelp and can be achieved with other iodine sources. In summary, kelp’s reputation for supporting nail health is supported mainly by tradition and its nutritional content, rather than by direct clinical evidence.

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