Ciao JoeItalia7 !
The website I have often used is
www.webmd.com. It has a 'Complementary Medicine' section - one that addresses biologically based therapies. This includes information and links about vitamins and mineral therapies, food therapy, alternative medical systems (Ayurveda, homeopathy, naturopathy, and Chinese medicine), energy therapies (acupuncture, etc).
Best wishes for useful research,
Esther