Homoeopathic Medicines are prepared from substances found in nature. Many minerals like calcium, magnesium; metals like gold, silver, zinc, copper; various plants (some of them even known to us as medicnal plants like Tulsi, camphor, aloe vera etc) are all used to prepare homoeopathic medicines. Even substances like cows milk is a useful homoeopathic medicine. These medicines are in extremely diluted form, and work on the energy level in the body.