Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Brazil nuts (Bertholletia excelsa) are primarily valued for their exceptionally high selenium content. Selenium is an essential trace mineral with a well-established role in supporting the function of the thyroid gland, which is a key component of the glandular (endocrine) system. Selenium acts as a cofactor for enzymes such as glutathione peroxidase and is critical in the synthesis and metabolism of thyroid hormones. Multiple scientific studies have demonstrated that adequate selenium status is important for thyroid health, including the prevention of thyroiditis and the maintenance of optimal thyroid hormone levels (Ventura et al., 2017).

Brazil nuts are one of the richest natural sources of selenium, and consumption of just one or two nuts can provide more than the daily recommended intake of selenium for most adults. Supplementation with selenium, including via Brazil nuts, has been shown to benefit individuals with autoimmune thyroid conditions such as Hashimoto’s thyroiditis and Graves' disease (Wang et al., 2015). However, because selenium is toxic in high amounts, intake should be carefully monitored.

Although Brazil nuts have not been used historically in traditional medicine specifically for endocrine or glandular support, their use is scientifically validated due to their nutritional profile and research on selenium’s role in endocrine health.

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