I would say it's as powerful as a steroid as far as weight gain goes. They use it together with steroids for people with HIV/AIDS or cancer to counteract weight loss. I can literally gain a pound a day on it just by taking 1 pill, and that is before going to sleep and waking in the morning and checking my weight when already in a cutting cycle. Where did the weight come from? It makes sense that they use it for those people who are sick. Is it fat? Is it water? I doubt it could be muscle. I can't seem to find any information on what it could be.