Memorial Sloan Kettering Cancer Center’s About Herbs database

MedlinePlus Herbs and Supplements 

National Center for Complementary and Integrative Health (USA)

The Complementary and Natural Healthcare Council (CNHC) are the UK voluntary regulator for complementary health practitioners. It was set up with government support to protect the public by providing a UK voluntary register of health practitioners.

National Institute of Medical Herbalists

The British Medical Acupuncture Society 

The British Acupuncture Council 

International Federation of Professional Aromatherapists