A dietary supplement in capsule or tablet form includes a source of zinc in an amount equivalent to 6 mg to 40 mg of zinc chloride； optionally a source of chromium in an amount equivalent to 100 micrograms to 1000 micrograms of chromium picolinate； optionally from 4 micrograms to 100 micrograms of Vitamin B12； optionally an extract or powdered form of American Ginseng in an amount that provides from 20 mg to 200 mg of ginsenoside(s), or 20 mg to 200 mg of isolated or synthesized ginsenoside(s)； optionally an oil, extract or powdered form of cinnamon bark in an amount that provides 1000 mg to 5000 mg of methylhydroxychalcone polymer； optionally 2 mg to 50 mg lutein； and optionally green tea extract in an amount that provides from 200 mg to 4000 mg of epigallocatechin gallate or 200 mg to 4000 mg of isolated or synthesized epigallocatechin gallate.
