Brazil nuts, despite their name, don't necessarily come from Brazil. The nuts available on the Polish market, for example, come from Brazil, Bolivia, or Peru. One of the main reasons people reach for them is selenium — but how much of this mineral do Brazil nuts actually contain, and does the amount really depend on the country of origin?
Brazil Nuts Selenium Content Test – Watch the Video
Do Brazil Nuts Contain Selenium?
Absolutely! Selenium is one of the main reasons Brazil nuts are so widely recommended. The standard daily requirement for this mineral is 55 mcg for women and 70 mcg for men. A single kilogram of Brazil nuts, however, contains around 1,900 mcg of selenium — many times more than the daily requirement. But there's no need to worry about selenium overdose from Brazil nuts. To cause acute selenium poisoning, you would need to eat at least 100 g of these nuts every single day, and specifically nuts with a very high selenium content. (How much selenium Brazil nuts contain varies depending on the type of soil in which the trees grow.)
Brazil Nuts from Brazil vs. Bolivia – We Compared Them!
A common belief holds that nuts harvested in Brazil contain significantly more selenium than those from other countries, since selenium levels in nuts depend on the concentration of the mineral in the soil and the tree's ability to absorb it. However, tests we conducted at a partner laboratory show that this theory is only partially true. Our results confirmed that, yes, selenium levels in Brazilian-origin nuts are higher than in those from Bolivia — but the difference is only around 10%, not several times higher or even 20 times higher, as some might expect.
{{single_product_01}}
How Much Selenium Is in One Brazil Nut from Brazil vs. Bolivia?
Our research shows that nuts from Brazil contain around 11.5 mcg of selenium per nut (231 mcg per 100 g), while nuts from Bolivia contain 213 mcg per 100 g — roughly 10.5 mcg per nut.
Health Benefits of Brazil Nuts – Why Is Selenium So Important?
Selenium is a powerful trace mineral that plays key protective and regulatory roles in the body. According to official scientific positions and claims approved by the European Food Safety Authority (EFSA), selenium helps protect cells from oxidative stress — which matters greatly, since an excess of free radicals can cause damage at the cellular level. In addition, maintaining optimal selenium intake supports healthy thyroid function as well as a well-functioning immune system. Interestingly, this mineral also helps maintain healthy hair and nails.
Not Just Selenium – What Other Nutrients Do Brazil Nuts Offer?
While selenium takes center stage, Brazil nuts are packed with other nutrients and make an excellent addition to a balanced diet. They are a great source of healthy fats (both monounsaturated and polyunsaturated), which support brain function and cardiovascular health. They also contain valuable minerals such as magnesium, copper, zinc, and phosphorus, as well as vitamin E — often called the "youth vitamin." Brazil nuts are a nutrient-dense snack for anyone looking to support their nervous system and overall vitality.
How Many Brazil Nuts Can You Eat Per Day?
Taking into account the daily selenium requirement (55–70 mcg) and the high selenium content confirmed by our testing, the generally accepted safe and optimal serving is 1 to 2 Brazil nuts per day (3 at most). This is more than enough to meet your daily selenium needs. It's worth keeping in mind that these nuts are calorie-dense, and chronic excess selenium intake can lead to a condition known as selenosis (selenium toxicity). When it comes to Brazil nuts, less truly is more.
On That Note — What Are the Symptoms of Selenium Toxicity?
Selenium is essential for our health, but as with everything — moderation is key. When there's too much of it in the body, the signs are usually fairly clear. These can include a metallic taste in the mouth, a garlic-like odour on the breath, brittle nails, hair loss, fatigue, or digestive issues.
In practice, there's no need to worry about this if you occasionally eat a few Brazil nuts. Just keep in mind that Brazil nuts are an exceptionally concentrated source of selenium, so a little really does go a long way.
How to Store Brazil Nuts to Keep Them Fresh
Due to their high natural fat content, Brazil nuts are prone to going rancid and losing their flavour over time. To keep them crisp and nutritious for as long as possible, store them in an airtight container or jar in a cool, dark place. During warmer months, or once the original packaging has been opened, the fridge is an excellent storage option.
Fun Fact: Real Brazil Nuts Grow Wild!
Did you know that Brazil nuts are almost never grown on commercial plantations? True Brazil nuts come from towering, wild trees (Bertholletia excelsa) that can reach up to 50 metres in height, deep in the heart of the Amazon rainforest. They are harvested using traditional methods, directly from their natural habitat. By choosing Organic Brazil Nuts, you're not only taking care of your health — you're also supporting sustainable trade that provides livelihoods for local communities and actively helps protect the precious Amazon rainforest from ongoing deforestation.
References:
Thomson CD, Chisholm A, McLachlan SK, Campbell JM. Brazil nuts: an effective way to improve selenium status. Am J Clin Nutr. 2008 Feb;87(2):379-84.
Godos J, Giampieri F, Micek A, Battino M, Forbes-Hernández TY, Quiles JL, Paladino N, Falzone L, Grosso G. Effect of Brazil Nuts on Selenium Status, Blood Lipids, and Biomarkers of Oxidative Stress and Inflammation: A Systematic Review and Meta-Analysis of Randomized Clinical Trials. Antioxidants (Basel). 2022 Feb 16;11(2):403.
Ou Y, Jiang B, Wang X, Ma W, Guo J. Selenium and colorectal adenomas risk: a meta-analysis. Nutr Cancer. 2012;64(8):1153-9.
Sayehmiri K, Azami M, Mohammadi Y, Soleymani A, Tardeh Z. The association between Selenium and Prostate Cancer: a Systematic Review and Meta-Analysis. Asian Pac J Cancer Prev. 2018 Jun 25;19(6):1431-1437.
