Zinc Synergists: Magnesium, chromium, cobalt, tin, Vitamin B2, Vitamin D, Vitamin E, [Vitamin A - small amounts]*.
Zinc Antagonists / Inhibitors: Iron, calcium, phosphorus, selenium, sodium, nickel, copper, Vitamin B1, Vitamin C, niacin / niacinamide, folic acid, choline, lecithin, alcohol, phytic acid, oxalic acid, [Vitamin A - large amounts]*.
Note: Calcium is a zinc antagonist at low, or normal phosphorus levels. However, with high phosphorus levels, extra calcium may be required to reduce zinc loss by helping to lower elevated phosphorus levels. This can also be accomplished by adding Vitamin B5.