First off, Jarrow is a trusted brand with me, so I do look at their stuff & a few other brands that I like. I wanted zinc b/c I have 2 adhd kids & zinc is an essential mineral. However, you should not exceed 15mg a day (can be toxic in large doses & it can deplete copper levels, which are very important too) - this is the right balance of zinc & copper! Zinc is involved with so many of our enzymes, it's truly an essential and especially for growing kids. In fact, a zinc deficiency has been indicated in many studies that have to do with hyperactivity and impulsivity. It is a cofactor for our GAD enzyme (needed for GABA), so low doses are seen with anxiety, as well. It is necessary for testosterone & the human growth hormone. Add on skin issues (eczema, etc) - It really is quite fascinating when you research it's role. But again, no more than 15mg a day is recommended b/c toxic levels deplete other minerals. copper is vital as well. I continue to get this one b/c of the dosage & copper addition. (As well as the price) I do recommend that you do your own research..this are just some the things I've gotten from mine