What is DHEA OR Carnitine?

What is 50mg DHEA or 500mg - Carnitine. What would either of these do for me? I am losing 10 to 13 pounds a month. Would taking one of these supplements help me to lose more? Is it safe to take them? I already take a iron pill, 4 tums for calcium, 2 chewable vitamins, and a stomach pill (prevacid). I saw these mentioned on another post and wondered about them. Thanks Angela

DHEA and Carnitine are metabolism boosters. They are options for AFTER you reach the majority of your weight loss(18-24 months)if you have trouble losing the rest (if any) of your weight.