It is the field of organic chemistry, the definition of natural products is usually restricted to mean purified organic compounds isolated from natural sources that are produced by the pathways of primary or secondary metabolism. The art or practice of using herbs and herbal preparations to maintain health and to prevent, alleviate, or cure disease and a plant or plant part or an extract or mixture of these used in herbal medicine by the Plant extraction method of drug formulation. Herbal and drug interaction and evaluation, in which the herbal drug is used to diagnose, cure, treat, or prevent disease. Drug therapy is an important part of the medical field and relies on the science of pharmacology for continual advancement and on pharmacy for appropriate management of Herbal drugs/compounds discovery and development. A pharmacological study of Natural herbal products is a method of using natural herbs and plants to promote physical, emotional, and spiritual health. Individuals interested in studying herbal pharmacology at the clinical level of alternative medicine.