Thank you @phillipg :-) Yes just make sure when you're looking for a supplier, read the reviews on their service. By and large people who deal in this seem to be honest, but as with every industry there are always the scammers.
As someone who seems very interested in maximizing output, have you tried microdosing psilocybin or LSD?
When I was younger (I'm 45) I did a lot of acid and a lot of shrooms; obviously those were for recreational purposes. However recently I have heard about the benefits of microdosing and am very interested to try.
I think I'd like to find some good psilocybin as I always preferred that to acid. Though I was very intrigued to hear that some CEOs of massive corporations have been microdosing LSD!
I would definitely highly recommend Modafinil, when I first started taking it I tried half at a time, which was great. I soon moved onto one; I once tried two, however it was too much for me and I felt like I couldn't sit still :-)