The Internet is a popular tool for marketing and purchasing herbal dietary supplements (DS). Various web-sites sell these products purely for recreational use. A US team describe the content of websites that advertise and mar ket herbal DS for recreational use (i.e. for the purpose of altering mood, behaviour or perception, ‘getting high’, or as a substitute for a drug of abuse). Four major search engines and the search terms ‘buy herbal high’ and ‘buy legal high’ were used to identify websites selling herbal DS for recreational use. Websites were evaluated for their country of origin and for compliance with the Dietary Supplement Health and Education Act (DSHEA). Products were evaluated for their ingredient lists, effect claims, comparisons with illicit drugs, adverse effects, drug interactions and contraindications. Twenty-eight unique websites with 119 products were evaluated. Most sites were in the USA (54%) and were in compliance with DSHEA. Forty-seven per cent of the products were likened to illicit drugs, typically marijuana (48%) or 3,4-methylene dioxyamphetamine (Ecstasy; 23%). The most common product ingredients were ephedra alkaloids (27%), Salvia divinorum (divining sage) (17%), kava (not specified) (10%), guarana (10%), Acorus calamus (10%) and damiana (10%). Effect claims frequently involved the products’ use as a hallucinogen (51%) or stimulant (39%). Sixty-four per cent of the sites mentioned adverse effects and 54% mentioned drug interactions.