If you're over 18 or you're testosterone is below normal, you may need supplements to increase your body's natural production of testosterone. First be sure to get 9+ hours of sleep, have a good monounsaturated fat intake, lower body fat with aerobics and weight training, reduce stress, avoid alcohol and other drugs (especially if you're under 21--don't be retarded), and drink lots of water (.66% of your bodyweight in ounces, or simply 8 12oz. glasses daily).
ZMA (Zinc Monomethionine Aspartate plus Magnesium Aspartate and vitamin B-6) - Don't be fooled; ZMA does not increase you're strength or testosterone 250%, it only does that compared to a placebo. Still, it is a very beneficial supplement for anyone. NCAA football players taking it for 8 weeks of spring training increased their free testosterone by 30%, their strength by 11.6%, and their IGF-1 (insulin growth factor-1) by 3.6%! ZMA improves sleep. Feel free to take it if you're under 18; it's all-natural.
Tribulus Terrestris, or puncture vine, is an herb that is supposed to increase the body's endogenous (natural) testosterone production.
Tribestan and
Anabolic-Matrix Rx seem like good choices. IronMagazine gives Tribulus a 3/5 in its
supplement review.
Fish oil, containing Omega-3 and Omega-6 fatty acids, is very effective for burning fat while increasing muscle. It raises testosterone levels.
Yohimbine HCL (not just yohimbe) - found in such products as Nutrex Lipo 6
Methyl-DHorny Goat Weed