The safe daily intake of Brazil nuts is generally 1 to 3 nuts per day to avoid the risk of selenium toxicity. Most sources suggest consuming up to two Brazil nuts a day as a practical and beneficial amount, since Brazil nuts are extremely rich in selenium, which in excess can lead to negative health effects such as selenium toxicity.

Selenium Content and Safety

• Brazil nuts contain very high amounts of selenium; two nuts typically provide sufficient selenium for daily needs without risking overconsumption.
• The upper safe limit for selenium intake is around 400 micrograms per day, and consuming more than 3 nuts risks exceeding this.
• Selenium toxicity symptoms include brittle nails, hair loss, skin rashes, and more severe complications in extreme cases.

Recommendations

• Eating about 1 to 2 Brazil nuts per day is widely recommended to gain the health benefits of selenium without crossing safe intake limits.
• Consuming more than 3 nuts daily could increase the risk of selenium overdose.
• People allergic to nuts should avoid Brazil nuts altogether.

Additional Notes

• There is some consideration of trace radioactivity exposure in Brazil nuts, but at typical consumption levels (1-2 nuts daily), this is not considered harmful.
• Brazil nuts may help with immune support, brain, and heart health primarily through their selenium and antioxidant content.

Thus, sticking to 1 to 3 Brazil nuts per day is the safest recommendation for most adults to enjoy their nutritional benefits without health risks.