Selenium is unevenly distributed in the earth’s crust. The primary nutritional source is the soil from which it is absorbed by plants and enters the food chain. Geographical variations in the selenium status of populations therefore exist, necessitating selenium supplementation
Dietary sources of selenium include unrefined grains, organ meats such as kidney and liver, fish, and nuts (brazil nuts are particularly rich in selenium)
However, the selenium content of forage crops depends upon its availability from the soil
The recommended levels for selenium supplementation in humans: Ranges from 50-200 μg/day
The current recommended daily allowance (US RDA) for both men and women is 55 μg/day. The recommendation also states that the daily intake should not exceed 400 μg/day from all sources
