I looked at foods with zinc, and I don't eat a lot of them. I see acne is one of the signs of zinc issues (as many of you are mentioning skin related issues). The dermatologist I saw recently flat out said there is no connection between skin and what we eat. I would have to significantly disagree, as I am a complete case of it.
I did three things that helped significantly: a vitamin (which has 100% daily recommended amt of zinc, but it also has good amts of other vitamins like a, b, c, e), switched to real soap (no more of the sls or detergent soaps that were drying my skin and making it ridiculously oily, irritated; I was cetaphiled to death with no improvement), and got rid of shampoos (using baking soda water or my own homemade soap/dr. bronner's), and bragg's apple cider vinegar (helped return skin to slightly acidic ph, which is what skin is supposed to be and naturally reduces bacteria).
So, H's vitamin only has 20% RDA of zinc. He does eat peanut butter. What are others doing to naturally increase zinc? It says that too much can cause abdominal pain, vomiting, and diahrrea. Gi issues are what many of these little ones have already. :-( Too much and you really can't tell which is the problem...