Allow soldiers to bring vitamins or supplements to basic training

I am thinking about joining the army and we are not allowed to bring vitamins or supplements to basic training I want to be able to bring them with me I believe it would help the performance for some? vitamins Boost energy, beat stress, improve performance, and supports muscle growth so why would they not be allowed? Numerous studies have shown the health benefits of the Daily vitamin and other supplements . woman can continue to take birth control pills so why can't anybody be still taking their vitamins and supplements don't we want strong healthy soldiers so if someone may benefit they should be able to bring them to Basic Training