you guys are COMPLETELY missing out by no taking the absolutely #1 supplement, that is Fish Oil. It is literally a cure all for so many things. It is an absolute protector against heart disease, one of the biggest killer and the NewEngJMed says it reduces your risk by 50%. Also, it is a biggie against mental disorders, also extremely beneficial to young children and esp. pregnant women.
Also, there is very, very good evidence for Glucosamine and to a much lesser extent Chondroitin. The trouble is doctors don't make much money on either of these supplements and they are widely and cheaply available, so no doctor power needed.
Multivitamins may or may not work, evidence is controversial, as is for many other vitamins, but if you look at fish oil and glucosamine you will find they have been quite proven. The studies on glucosamine are remarkable, showing decrease in loss of joint knee space. But the MD.'s twist everything around, like any politician, can you believe the groundbreaking study showed that Gluc didn't work for mild knee pain, only severe pain, and so it was widely publicized as not working!
Anyway, I'm a Chiropractor and do a lot of personal research on medline. http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed
That is a useful site to know how to use. I have many studies on my hard drive and would be happy to share them with those who are interested. (although I'm out of date by about a year or so).
off topic, but check out all the chiro studies i reviewed on my website www.ourchiropractic.com
it is basic, just download the pdf.'s and look at them. Note: hate to miss business with pleasure around here, but just trying to contribute.