I just started taking mine today. I got the Now Foods 50 MG with Copper. One thing I instantly noticed was I started pissing like a racehorse. This morning I probably pissed out twice as much as I drank. Did a little bit of google searching and some studies have shown that if you're Zinc deficient you can be holding excess water.
I took my first pill in the morning on an empty stomach with nothing but water and I had 0 stomach issues.
I took my second pill at lunch, but had cheese with it so I'm guessing that second tablet won't be absorbed?
Will take the last before bed with Magnesium and iodine (pretty sure my thyroid is messed up, and I am also about 99% sure I don't have Hashimoto's).
I am going to try 3, 50mg tablets a day the first week, 2 the next, then one after that and see how things go.
I took the test at my Dr's office where he gives it to you in liquid form and if you have adequate zinc you will want to spit it out, minor metallic taste if you're borderline, and no taste at all if you're deficient. I mean, it didn't exactly taste like water, tasted a little thicker, but I tasted no metallic taste to it. I'm hoping this helps me.
Also, I found this Q&A with an Oregon State professor and Zinc researcher who answers a lot of questions about the benefits and risks of zinc. The benefits are numerous, and the risks seem very, very minimal. Outside of stripping copper, she doesn't talk about much of anything because we just piss out the excess.
http://lpi.oregonstate.edu/fw08/zinc.html