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I had horrific side effects 40 minutes after I took my first pill. With no warning I was throwing up, seeing black spots, instantly got weak like I was going to faint, and profusely sweating to the point where my clothes were soaking wet. The first episode of these symptoms lasted for about an hour constantly throwing up and diarrhea. Once I got myself up to walk to my bedroom it all started again and happened for another 10 or so minutes. I ended up reading that the recommended dosage for zinc is 8-11 mg per day and not to exceed 40mg. Writing this review as a warning to other people that might have these side effects.