This isn’t something people normally think about. But trust me, there is a lot of bunk/underdosed gear now a days. Even shit that’s cheap to make like test and dbol, I’ve seen and even used underdosed/completely fake products. I have since found a reliable source that I love (no source sharing on here).
People will run what they think is 500 MG of test a week, but it’s actually 200, and they get some gains, and feel it working so they know it’s real, but they weren’t actually using 500. Then they use 750 their next cycle and get the gains they were supposed to get in the first cycle… in some cases, this is also why some people can tolerate 750 mg of Tren ace a week, or 100 mg of dbol, while yes some people are gifted and can handle amounts like that with little sides, you’d be surprised how many people are just running underdosed gear.
I’ve heard of sources that are hit or miss, sometimes being called selective scammers. Say 50% of their stuff is legit, there’s gonna be positive reviews, and the other 50% is gonna get shit gear and think the source sucks, there have also been plenty of “exit scams” where a good source goes bad in an attempt to make one last profitable bang before they disappear.