Does anyone know of a definitive reliable source for information on vitamins, supplements and OTC remedies?

Here is a source that I found very informative. This is just a write up but the book was great.

http://en.wikipedia.org/wiki/Natural_Cures_%22They%22_Don't_Want_You_to_Know_About

Try some of the Rodale Institute/Rodale Press information, just be warned they’re somewhat to the extreme on some of their views.
www.rodaleinstitute.org

The Mayo Clinic has good summaries of research on many drugs & supplements
http://www.mayoclinic.com/health/drug-information/DrugHerbIndex

I think highly of this site. Also, this site from NIH.

Thanks everybody all great links! The Mayo and NIH links are where I think I will start my learning process!

Good choice, @Cruiser. There is a lot of conflicting information available on herbals and supplements.

I also use PUBMED to find controlled studies on various substances.

Here is an excellent sources – Harvard, Mass General people.

Natural Standard – http://www.naturalstandard.com/

Most excellent link @DandyDear711! I like the section on interactions….Just what I was looking for!! Thank you!

My pleasure @Cruiser !

I have a fun but unprofessional way to research them: I go to vitacost.com and read what their customers say. I’ve posted on there myself. lol Yes; my posts show up later.