do. I have only thrown up about 3 times in my life. 2 of them before thI e age of 5. Once at 19 from severe food poisoning that required hospitalization. When I get copper dumps I get naseuaous. Honestly I don't think I am absorbing the zinc that well. When I used to do high does Vitamin C I wld get pretty sick to my stomach but not too much anymore now that I feel alot of the copper is gone. (vitamin c chelates copper) Zinc overcomes inbalances it, molybedenum blocks the absorption. If mercury is blocking uptake of zinc you will have to take alot to make yourself sick. My recommendation would be to do a zinc taste test with zinc tally from metagenics or another company. If you fail you are probabaly just experiencing a copper dump when you get sick.