my opinion with "user feedback" is person first off "true believer" - like people who blow things up, lol. they have "faith" in weird one-off things in product ("this is the one, finally!), that not every other company also selling as well - why- it work or not? all other companies not also want jacked customers money, lol. other companies HUGE! like optimum nutrition for example - supp wing of food conglomerate. they not able to find ingredient that small mom and pop company find? (all can access pubmed and call china/india, and optimum et al probably have actual phd's and a lab!).
then true believer spend own money - so not want to admit spent money for nothing - so of course massive gains. also want to post on how knowledgeable they are - they know how to "do it right" - so more gains happen.
then maybe they sloppy for a while, but because faith and money spent, now time to track every calorie, have perfect macro, get in gym/cardio every day, etc... oh wow - it work!!!!
of course there is then placebo possibility - but that go back to faith/believe above i guess. look up each ingredient and look at provided references - see where human athlete ate it and had enough gains to justify spending, over placebo group - then maybe try it worth trying, but even then, we all taking bio-grow?
really need many, many studies from different people, all showing work - like baking soda!
but this how companies stay in business (forget that one, we found new one! this it this time!) every year. take a few years for lifters to gain enough knowledge to say "nah, it's just like its always been - sleep eat and train heavy" - by then, new group come along!