Homeopathy is the most controversial of all Complementary and Alternative Medicines. Like many types of medicine, (the mechanism of panadol is not fully understood for example), the medical jury is out as to how homeopathy works. Regardless of this fact homeopathy is one of the most globally used complementary medicines with upwards of 550 million users in at least 65 different countries. Homeopathy is still the leading form of complementary medicine in Europe. In India, it is the sole form of medicine for over 100 million people. In many countries, homeopathy is considered to be on an equal footing with conventional medicine. Homeopathy is integrated into the public health systems of many European, Asian, African and South American countries. In the UK, homeopathy has been supported by the British National Health Service (NHS) since it began in 1948.