Anandamide is an endogenous (occurs naturally in an individual and doesn't come from an exterior source) cannabinoid neurotransmitter. Isolated in the 1990s it was the first cannabinoid discovered and was named after the Sanskrit word for 'bliss'. It is involved in pain, memory functions, appetite, depression, and fertility. The name cannabinoid is used because of the similar functions to THC, the main chemical in marijuana. Anandamide is being researched as a possible therapeutic drug used for issues like depression.