Honestly, gear isn’t hard to find. Reliable sources are a little rarer, but there’s some good ones. Most of the “prohormones” (a majority are actually active steroids) aren’t actually banned in the UK so you could order from overseas. But overall, much less rare than a lot of people seem to think.
Anyway, yes, some of that stuff is stronger than hell. The most I ever weighed while “natural” was about 208. After messing around trying some SARMs, I was up over 220. I took some stuff that still put on over a pound a day, on average. I knew it would be strong, but I didn’t think I’d even be capable of adding that much weight considering my starting point.