A substance made in the body and also found in supplements. It appears to be necessary for normal functioning of sperm cells. Some individuals develop diarrhea after as little as a few thousand milligrams of vitamin C per day, while others are not bothered by ten times this amount. Zinc intake in excess of 300 mg per day may impair immune function. While doctors of natural medicine believe this increase may be an error, people with IDDM supplementing with zinc should consult a nutritionally oriented doctor.
Zinc competes for absorption with iron, calcium, and magnesium.
A multimineral supplement will prevent mineral imbalances that can result from taking high doses of zinc for extended periods of time. So far, experts in the field have put little stock in this report because its results have not yet been confirmed in animal, human, or even other test tube studies. Vitamin B12 supplements are not associated with side effects. Carnitine has not been consistently linked with any toxicity. SAM is normally produced in the liver from the amino acid methionine, which is abundant in most diets.