Selenium :- It is part of the enzyme system of the body. Deficiency of selenium leads to heart (cardiomyopathy) and muscle involvement (myopathy). It is particularly seen in Keshan province in China where the soil is deficient in selenium. Excess of selenium causes alopecia, abnormal nails, garlic odor to the breath and fatigue.

Sources of selenium :- Vegetables, meat, water.

Recommended Daily Allowance (RDA)
< 6 months of age - 10 µg
6-12 months of age - 15 µg
1-6 years of age - 20 µg
7-10 years of age - 30 µg
> 11 years of age - 50-75 µg