supplements to take when i workout?

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ok so im barlet going to start my membership at planet fitness n a few day and I am going to be going light weight lifting 10-20 pounds to add a little muscle and get more definition so I can look good for summer. because im super out of shape im 5'3 and 160 pounds trying to get to 125 by june so I can look good for my boyfriend when he gets back from Iraq :)