Some conditions may increase your need for zinc. In addition, premature infants may need additional zinc. Increased need for zinc should be determined by your health care professional. Claims that zinc is effective in preventing vision loss in the elderly have not been proven. Zinc has not been proven effective in the treatment of porphyria.
Injectable zinc is given by or under the supervision of a health care professional.
Other forms of zinc are available without a prescription. Follow carefully any diet program your health care professional may recommend. Foods stored in uncoated tin cans may cause less zinc to be available for absorption from food. The daily amount of zinc needed is defined in several different ways. If you are taking this dietary supplement without a prescription, carefully read and follow any precautions on the label.