Gone are the days where you could go to a doctor and get a script to buy steroids from a pharmacy, due to steroids being abused by athletes and bodybuilders they are now illegal. The only way to buy steroids now is on the black market, either from a dealer or from an online source. When steroids were legal and were purchased from a pharmacy, the only steroids you could get were pharmaceutical grade which were extremely high quality and worked far better than the “underground” stuff. Today pharmaceutical steroids are harder to get hold of and cost a lot more, for this reason many people opt for black market steroids which usually are lower quality and can cause infections due to them being produced in an non-sterile environment. Only injectable steroids need to cause concern when purchased from an underground lab, oral steroids don’t need to be produced in a sterile environment.
Animal-based studies also show that resveratrol can dramatically boost exercise tolerance and may aid in helping to control insulin resistance while encouraging bodyfat loss. That said, the doses that accomplished those effects in animals were massive compared to the levels of resveratrol found naturally. You would need to drink thousands of bottles of red wine (a good natural source of resveratrol) to obtain similar doses. Still, the new study showed that when low doses of resveratrol are combined with either leucine or HMB, the effect is synergistic, leading to body-composition changes similar to those seen with huge doses of resveratrol. Of course, this study involved rodents, so we don’t know yet whether the effect also occurs in humans. We do, however, know that the mechanisms behind the effect exist in humans.
It's no secret that anabolic steroids (., drugs that mimic testosterone) build muscle mass. However, existing supplements that claim to boost testosterone, like Tribulus Terrestris, D-Aspartic Acid, Eurycoma Longifolia and Fenugreek, have no scientific support proving that they are anabolic agents in young and healthy men. Even if they do boost testosterone slightly, the effect is not great enough in magnitude or duration to cause muscle growth. A much better approach than using alleged testosterone boosters is to train harder, sleep more and eat more high-quality food (and take creatine, protein and HMB).