First post for me. I've been lurking for a while, and since I was just researching Zinc yesterday, I thought this was a good time to chime in.
You should actually be a little careful with Zinc. 50mg is a lot of Zinc, especially when you consider that it could be included in a multivitamin that you're also taking. Here's a link so you can read up yourself:
As far as acne is concerned, vitamins and minerals make it worse (at least for me). I take a One-a-Day type vitamin daily along with 250mg of Magnesium and 10mg of Zinc and I always have some acne, and it wasn't there before the supplements. I started 3mg a day of Creatine a week ago, and I swear that's making it worse too.
Zinc also helps us produce Testosterone, which aids in zit production among other things. Although, you probably shouldn't have any problem with your testosterone level at 16. You've probably got more than you know what to do with.
Anyway, just my $0.02. Feel free to read-up...