Bio-identical Hormones have exactly the same chemical structures as the hormones we naturally make in our bodies. Since their molecular structure is exactly the same as the original, the body accepts them very well and hence they are able to deliver their physiological function with minimal side effects. Hence they are also referred to as “Natural Hormones”. Many of them are derived from natural sources such as yam and soya. Bioidentical hormones are made in compounding pharmacies and can be customized to suit individual requirements.