What are Brazil nuts?
Brazil nuts are the edible seeds of the Amazonian Brazil nut tree (Bertholletia excelsa). They are widely recognised as one of the richest natural food sources of selenium.
Why are Brazil nuts so high in selenium?
Brazil nut trees naturally absorb selenium from the mineral-rich soils of the Amazon rainforest. As a result, the seeds accumulate exceptionally high levels of this essential trace mineral compared with most other foods.
Why is selenium important for thyroid function?
Selenium contributes to the normal function of the thyroid gland by supporting enzymes involved in the production and activation of thyroid hormones. It also contributes to the protection of thyroid cells from oxidative stress.
Do all Brazil nuts contain the same amount of selenium?
No. The selenium content of Brazil nuts can vary considerably depending on where they are grown and the selenium content of the surrounding soil. This natural variation is one reason why supplements often use standardised selenium ingredients when a precise dose is required.
Are Brazil nuts a common allergen?
Yes. Brazil nuts are classified as tree nuts, which are recognised as major food allergens in the UK, EU and USA. Individuals with a tree nut allergy should avoid Brazil nuts and products containing Brazil nut-derived ingredients.
