The Law of Opposites, Contraria contrariis curantur (Opposites are cured by opposites), is a natural law that is used to create homeostasis, or balance, within the body. While the Law of Similars is a core principle in the application of homeopathic remedies when curing disease, the Law of Opposites is the key principle of regimen or lifestyle. As examples, if a person is lacking Vitamin C in their diet, then they must increase their Vitamin C intake. As well, if a person is drinking too much coffee, then then need to cut down on their consumption. While this law may seem simplistic, it is the basis of creating balance within the body which is a core requirement of a healthy, physical constitution. This, in turn, plays a key role in curing the patient. Once a homeopathic remedy is given to destroy a disease, it is then up to the body to complete the healing by detoxing the body of the negative effects of the disease. Having a strong and vibrant constitution is necessary, therefore, for the full restoration of health within the body. It is the Law of Opposites that guides us in creating such a radiant, physical constitution.
The Law of Similars stands in contrast from the Law of Opposites in that the former addresses true disease while the latter is used to redress simple imbalances in the body.