Commercial samples of herbal ingredients of a popular classical preparation ‘Trifala Churna’, Phyllanthus emblica L. (Amla), Terminalia bellirica Roxb. (Bahera) and Terminalia chebula Retz. (Harad) were evaluated to assess their quality in respect of identity, purity and strength. The raw samples of herbal drugs were resourced from Delhi, Hardwar and Cochin

markets. Evaluation is based on specific parameters and limits developed by standardising authentic samples of drugs.