On his Q&A shows, he will advise people on doses/timing of: Insulin, GH, T3, Clen, Tren, Testosterone, HCG, Clomid, Arimidex, Site-injections... and much more...
But then advises that people avoid caffeine; or use it sparingly.
I like the Dave's show but it seems odd that caffeine is looked at negatively.