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CONTENTS OF ZINC TABLETS
Though zinc currently has great popularity as a dietary supplement, there is surprising confusion about the strengths of the various types of zinc tablets now being sold. In an attempt to learn exactly how much zinc (as the element) there is in each type of tablet and capsule being marketed in health food stores and drug stores (where they can only repeat what is on the labels), the author called several manufacturers. Confusion was the only consistent finding. Most of them, who are merely repackagers, stated that they had no exact knowledge of the nature of their zinc products since they buy the crystalline powder from a chemical manufacturer.
Perhaps the biggest obstacle to a proper understanding of the problem was their lack of knowledge as to how much water is included, along with the zinc salts (sulfate or gluconate) in the crystalline powders from which the tablets and capsules are made. Eventually, one of the largest manufacturers put some of its research staff to work on the problem and, after about 10 days, came up with a definite answer. They told us that one 220 mg tablet or capsule of zinc gluconate contains 28 mg of zinc and that one 100 mg tablet or capsule of zinc sulfate contains 22.5 mg of zinc.
The Recommended Daily Allowance (RDA) of zinc, according to Goodman and Gilmann’s The Pharmacological Basis of Therapeutics (6th ed., p. 1553), is 15 mg. This amount, approximately, would be provided by one 110 mg tablet of zinc gluconate or by one 50 mg tablet of zinc sulfate. This much, it is believed, should be sufficient to maintain normal persons in a positive balance of zinc. Greater amounts than this, obviously, would be required to repair a deficiency state.
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