 [ Symptoms ] why do some vitamins contain too much zinc preservision areds has 348 mg and the max daily is 40 mg  why would they put that much in there now i am afraid to take it paid for it and opened it can not return it [ Disease ] you should call the manufacturer and ask the company why supplement companies are not regulated like drugs are so be careful and make sure your voice is heard zinc intakes above 150 mg have been associated with adverse effects such as low copper status and a lowered immune response no more than 40mg in supplements is recommended read this for more on zinc supplementation