Interesting, but of course it begs the question "what form of zinc?" Or, did they simply try to measure "zinc levels" (in serum? hair? urine? feces?) in people taking in different doses of calcium.
I find this study [PubMed ID: 17712948] interesting in Chinese adolescents. It claimed either no effect or increased absorption for zinc, depending on the subgroup. I still lean more towards the thought that dairy's effect on acne is more related to hormones (cow's milk is, after all, just filtered cow's blood -- so it's full of cow hormones) than to its calcium content. If it were the calcium, I would hope to see significant acne variation with how "hard" (full of calcium carbonate) the local drinking water is, and can find no such effect.
I'm still looking for whatever study might have spawned the lore that calcium decreases absorption of zinc. Recent studies do not seem to support the idea.
I'm also interested to hear about stomach upset in people taking zinc picolinate. I'm not known for having a strong stomach, but have had no problem with 180mg/day zinc picolinate (divided into 3 doses). Of course, the strongest predictor of nausea is always whether or not you expect nausea (that big ol' nerve from the brain to the gut transmits both ways!), so the best experiment would be to have someone slip you the zinc when you're not looking :-). I guess I did worry about feeling a little queasy one day, but I kinda hate to blame the zinc on a day when I ate 4 ice cream sandwiches :-).
And, for anybody doing their own zinc experiment, you might want to go all out and hit all the nutritional factors that have been implicated in acne: zinc, folic acid, selenium, chromium and omega-3 fatty acids.



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