Bioassays are very important in the screening of candidate plants for drug development. The simple, rapid and cost effective nature of bioassays facilitates screening of large number of samples. Plants effective in in-vitro assays are developed into prototypes, which ultimately get tested in in-vivo assays. In-vitro assays are also helpful in biological standardization of herbal extracts. Botanical products are complex with respect to their chemical composition. It is observed that a given herbal product may have required level of marker compound but the bioactivity may be unacceptable. This indicates that chemical standardization of herbal products is not comprehensive; hence there is a need for bioassay based standardization of herbal products. Bioassays developed by this lab are also useful in stability testing of herbal products. The bioassay lab has developed more than 25 assays and has made many international publications using them. Some of the assays developed in this lab include Acetylcholinesterase inhibition assay, Hepatoprotective assay, Brine shrimp lethality assay, Trypsin inhibition assay etc.