Zinc supplements vary in their dosages from 5–10 milligrams (mg) up to 25–45 mg of elemental zinc, and sometimes higher. Dosages in the lower range are typically used as a daily preventative, whereas dosages in the higher range are typically used to treat chronic conditions and zinc deficiency.

Caution: The tolerable upper intake level of zinc is 40 milligrams per day (mg/day) in adults.^[1][2] This value represents the highest level of daily zinc intake that is likely to pose no risk of adverse health effects to almost all people. Although some clinical studies have used daily doses above 40 mg/day for up to 12 weeks,^{[3][4][5][6][7]} caution should be taken when supplementing with zinc at or above this dose because the risk of adverse effects increases.