the only vitamins u have to be careful about "overdosing" in are vitamins A, D, E, and K... ADEK!
bcuz they are fat soluble.. but u don't need to worry about E bcuz i hear u need to be literally "drinking" it on a daily basis to overdose..
also, be careful about minerals.. though it's tedius to list all the dosages for minerals.. just know that minerals are overdoseable as well :wink:
u can take as much vitamin C or B as u want.. u piss out any extra and make ur urine bright yellow.. just be sure to drink a lot of water.. but u should be doing that anyway :wink: