Let's start at the very beginning of what Homeopathy is, a few years ago I didn't know myself and kept calling it "home something". I was studying Kinesiology and Health Science at York University, working out 5 times a week, eating a super healthy diet, but still had a skin condition, diagnosed as Acne Conglobata. It is a type of acne that leaves scars.
After trying every possible solution and giving up hope on ever healing my skin, a friend recommended a homeopath. A "home of what?" But I was ready to try anything and within two sessions my acne was gone, scars were healing and I so happy and relieved I decided to study Homeopathy myself and share this medicine with others.
Homeopathic medicine is based on a single law of therapeutics called the Law of Similars, "Similia Similibus Curantur" which means "like cures like". This law states that a substance that can cause the symptoms of a disease can also cure it. In fact, that's exactly what word "Homeopathy" means: similar ("homeo") suffering ("pathy").
Homeopaths use the process of provings to identify the characteristic curative property of a substance. A group of healthy people of different ages and gender is selected to stay under observation while receiving homeopathic remedies for a period of time. The newly developed symptoms are documented, compared at the end of the process and then recorded in Materia Medica.
Coffee for example, as a remedy Coffea Cruda can be curative for insomnia but as a substance coffee can cause sleeplessness.