Don't worry, as long as you buy it in a regular health care store, the safety problem can be ruled out first. Then let's talk about intake. Normal people take 15 to 18 a day and say that they will absorb these. A piece of zinc contains 50 mg, which you may not be able to absorb. If anyone absorbs it so well, the country will save food, so you can rest assured to eat. No problem.