"It is estimated that the Ayurvedic pharmacopoeia includes upwards of 1250 species, with approximately 300 of these in regular demand. Similar figures exist for Chinese, North American, and Western herbal medicine. In India and Sri Lanka most herbs come from the wild: in excess of 90 percent of herbal material used in Ayurveda comes from the forests, mountains, and plains of the Indian subcontinent and is sourced in an unregulated manner."