Synopsis

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

Norwegian kelp, a type of seaweed, is sometimes used as a dietary supplement for hypothyroidism due to its natural iodine content. Iodine is an essential trace element required for the synthesis of thyroid hormones. Historically, iodine deficiency has been a major cause of hypothyroidism and goiter, and the addition of iodine to diets (through iodized salt or supplements) has been an effective public health intervention. Kelp and other seaweeds are among the richest natural sources of iodine, and their use for goiter and thyroid health has a long tradition in some cultures.

However, scientific validation for using Norwegian kelp specifically in hypothyroidism is limited. While kelp can help in cases of hypothyroidism caused by iodine deficiency, most hypothyroid cases in developed countries today are due to autoimmune thyroiditis (Hashimoto’s disease), not iodine deficiency. Excessive iodine intake from kelp can, in fact, worsen autoimmune thyroid conditions or cause thyroid dysfunction in sensitive individuals. Clinical guidelines caution against the use of iodine supplements unless a deficiency is confirmed.

Overall, while there is a clear biological rationale for using iodine-rich foods or supplements in iodine deficiency-induced hypothyroidism, the routine use of Norwegian kelp for hypothyroidism is not strongly supported by clinical trials, and expert recommendations advise caution. The evidence rating is therefore low, especially outside of documented iodine deficiency.

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