Natural products, either as pure compounds or as standardized plant extracts, provide extensive opportunities for new drug leads because of the unmatched availability of chemical diversity. In contrast to modern medicines, herbal medicines are frequently used to treat chronic diseases. Standardization guarantees the content of one or more active constituents and marker compounds. The plant environment and genetic factors could significantly affect the biochemical components of the plant extract, in which plants are still the most abundant and cost-effective resource for drug innovation. Production of botanical drugs requires genetically uniform monocultures of the source plant in fully standardized conditions, to assure the biochemical consistency and to optimize the safety and efficacy of every crop. The present review article illustrates about the methods for standardization of herbal medicine and how the goal of preparing herbal medicines of consistent quality and effects can be achieved.

Key words: genuine crude drugs, herbal drugs, plant extracts, review