Evidence supporting the use of: Kelp (various)
For the body system: Hair

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Synopsis

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

Kelp, a type of seaweed, has been traditionally used in various cultures as a natural remedy to support hair health. Its popularity stems largely from its rich nutrient content, particularly iodine, iron, calcium, and vitamins such as A, C, and B-complex. Traditional medicine systems, especially in East Asia, have long included kelp in diets and topical remedies with the belief that it promotes hair growth, strengthens hair, and prevents hair loss. The rationale is that kelp's iodine content supports thyroid function, and since thyroid health is closely linked to hair health, kelp is thought to indirectly benefit the hair.

However, direct scientific evidence supporting kelp's effectiveness for hair growth or hair health is limited. Most studies focus on the effects of iodine deficiency on hair, rather than the specific benefits of kelp supplementation. While severe iodine deficiency can lead to thyroid dysfunction and subsequent hair loss, there is little data to suggest that kelp supplementation beyond normal dietary intake provides additional hair benefits in healthy individuals. Furthermore, excessive iodine intake from kelp can actually disrupt thyroid function and potentially worsen hair loss.

In summary, kelp's use for hair health is primarily rooted in traditional practices and anecdotal evidence, rather than robust scientific validation. Its potential benefit is mainly associated with correcting iodine deficiency, rather than serving as a direct hair growth promoter.

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