The stuff I took was a Revieweebie Reviewom a trade show I went to in Birmingham. It came in a sealed packet and is readily available on many websites. It also lists ingredients and instructions. Unfortunately it came in capsule form, which means you have no choice but to take it all, which is why I won't use it again, but the stuff I'm looking at buying next is Reviewom a similar wholesale, who I have used for years and know is reputable.
Placebo? In my case I don't think that is possible. Everything was heightened, to the point where my brain was telling me I should stop, but my body wouldn't allow it. We were playing pretty solid for the full 2 hours. Admittedly he did look like the guy I lost my virginity to when he was younger and was better looking than him, so I was very turned on, but even then... The headache the next day was very real too.