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Copper's in your food, and it's essential. Heavy metal is good for you. In fact, itâs vital for your good health. Not the Black Sabbath kind of heavy metal â although your musical choices are your own â but the heavy metal, copper. Copper is a mineral found throughout your body.
4. Zinc. Zinc plays an important role in the body's immune system and deficiency is rare because of the readily available food sources. The Recommended Dietary Allowances for zinc are 11 mg per day for men and 8 mg per day for women. For the vegetarian or vegan, legumes, oats, nuts and seeds are rich zinc sources.