Goosey
.
Whilst I understand where you're coming from and don't believe they are a contributing factor, you can't say they aren't working as they very well may be. They're just over ridden by a much more powerful substance
I don't believe the main stream type of supplement you buy in the shop is contributing to increased muscle tissue.
what is fact?
it burns a hole in your pocket.
resistance builds strength, the byproduct of size and flexibility.
*Food* supplies the nutrients.
sleep enables all this to happen.