Vitamin and mineral supplements have several other significant features that must be taken into account. First, complex interactions occur between vitamins and minerals. As a result, high doses of a single vitamin or mineral may be harmful or ineffective. For example, excessive vitamin C intake may affect the body's ability to absorb copper, and high doses of vitamin B-may produce deficiencies of vitamins B2 and Bg. Also, calcium cannot be utilized for bone health without adequate levels of vitamin D.
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