High-dose, but not low dose, zinc lozenges shorten the duration of the common cold. Daily doses greater than 75 mg showed a 42% reduction in duration of colds. The forms of zinc working the best are acetate and glycinate. Zinc acts as an antifhinoviral agent, inducer of interferon (prevents viruses from entering cells), and immune booster.

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High Dose Zinc Lozenges and Colds