<unk>  has been shown to increase serum testosterone levels over an eight-hour period in men when taken as a single oral dose of 300 mg per day, but a dose of 100 mg had no significant effect on serum testosterone. However, serum levels of estradiol increased following both the 100 mg and 300 mg doses. The study also reported that the serum level of estrogens and testosterone produced varied widely between individuals. A 2006 review paper summarized several studies that examined the effect of<unk>  on strength training. At dosages of 50 mg or 100 mg per day,<unk>  had no effect on muscle strength or size, or on body fat levels. One study used a daily dosage of 300 mg of<unk>  combined with several other supplements, and also found no increase in strength when compared to a control group that did not take the supplements. The review authors speculate that sufficiently high doses may indeed lead to increased muscle size and strength. However, due to the federal ban on<unk>  supplements, it is difficult to carry out new research on its effects. The review authors conclude that individuals should not use<unk>  supplements due to the lack of evidence of beneficial effects, the wide variation in individual responses to the supplement, and the risk of unknown side effects.
Androstenedione
Dehydroepiandrosterone
Dihydrotestosterone
Methyltestosterone
Dehydroepiandrosterone sulfate
Testolactone
3β-Androstanediol
Allyltestosterone