Homeopathy is a system of medicine basked upon the law of similars; like cures like. A homeopathic remedy is simply a dilusion of one or several botanical, mineral, or animal substances that create a gentle means of stimulating the body's innate healing abilities.
For example, everyone is familiar with the results of drinking too much coffee-shaky hands, jittery nerves, and insomnia. Coffea cruda, a homeopathic remedy made from unroasted coffee beans, is used to alleviate these very symptonms, whatever the cause. Like cures like.