Where to Find a Supplement Expert?

As I become more involved in my health in general, and lifting specifically, I’m starting to look for some expert advice in supplementation, especially as it relates to possible interactions between supplements. I’m not so interested in the more typical supplements like protein/creatine/glutamine, but instead things like herbs that act as test boosters, neurotransmitter precursors, etc.

My GP has no idea about any of this (not that I would necessarily expect him to), but I’m a bit suspect of the educational rigor possessed by the typical “herbalist”. Are there experts that apply the rigors of Western medicine to the medicinal properties of alternative medicines?

TIA