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

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Kelp, a type of seaweed, is often used to support thyroid gland function because it is a rich natural source of iodine. Iodine is an essential nutrient required for the synthesis of thyroid hormones, which regulate metabolism, growth, and development. Historically, kelp and other seaweeds have been consumed in coastal regions as dietary staples and are linked to lower rates of goiter (thyroid enlargement caused by iodine deficiency). Scientifically, there is clear evidence that iodine supplementation can prevent and treat iodine deficiency disorders, including hypothyroidism and goiter. The thyroid gland uses iodine to produce triiodothyronine (T3) and thyroxine (T4), so kelp supplementation can be effective in cases where dietary iodine is insufficient.

However, excessive iodine intake—such as from high doses of kelp supplements—can also cause thyroid dysfunction, including both hyperthyroidism and hypothyroidism, especially in susceptible individuals. Most evidence supporting kelp use is based on its iodine content rather than unique properties of the seaweed itself. Clinical guidelines recommend using dietary or pharmaceutical sources of iodine in cases of deficiency, and caution against unregulated kelp supplements due to variable iodine content and possible contamination with heavy metals.

In summary, there is moderate scientific evidence supporting kelp’s use to support thyroid function in the context of iodine deficiency, but it should be used carefully and ideally under medical supervision.

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