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

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Table of Contents

Synopsis

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

Seaweed, particularly varieties such as kelp, nori, and wakame, is a rich source of micronutrients, including iodine, iron, calcium, magnesium, and various vitamins (A, C, E, K, and B vitamins). These nutrients are important for overall health and, by extension, for the maintenance of healthy nails. Scientific literature indicates that deficiencies in certain minerals and vitamins—such as biotin, zinc, and iron—can manifest as brittle, weak, or pitted nails. Seaweed’s mineral profile suggests it could contribute to nail health by helping address or prevent such deficiencies. However, direct studies on seaweed supplementation specifically for nail health are limited. Most evidence comes from broader studies on micronutrient deficiencies or small-scale research in dermatology. While seaweed is traditionally incorporated into diets in East Asian cultures for general wellness, its specific use for nail health is not strongly rooted in traditional medicine. In summary, while there is a plausible scientific rationale for the inclusion of seaweed in diets to support nail health due to its nutrient content, robust clinical trials directly linking seaweed consumption with improved nail health are lacking. Therefore, the evidence is rated as low to moderate (2/5), based on indirect scientific support rather than direct clinical validation.

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