Source is modern aminos. You can try the stuff out I see Scott Mcnelly and Andrew berry say great things about it on think big body building so maybe worth a shot that’s really why I tried it out. As far as Vigorous steve and them posted on YT video above, they get paid to push the stuff, so I honestly don’t trust them on it. My coach said the stuff been out a good while that it’s nothing new and not worth the spend from what he’s seen in himself or his clients. Put me on Cardarine instead. Andrew berry says he notices a difference in himself and his clients, so it’s all over the place. I personally didn’t notice a difference so I can only speak on that.