Commercial samples of three herbal drugs of leaf origin viz. Adhatoda zeylanica Medicus., Azadirachta indica A. Juss. and Ocimum tenuiflorum L. were evaluated to assess their quality in respect of identity, purity and strength. The samples were resourced from Delhi, Hardwar and Cochin/Trichur markets. Evaluation is based on specific parameters and limits

prescribed in Ayurvedic, Unani and Siddha Pharmacopoeia and as well in other literature.