Adrenochrome

Adrenochrome, chemical formula C9H9NO3, is a pigment obtained by the oxidation of adrenaline (epinephrine). Adrenochrome monosemicarbazone, also known as carbazochrome, is a hemostatic, meaning it reduces capillary bleeding.
Megavitamin therapy advocates Abram Hoffer and Humphry Osmond claimed that adrenochrome is a hallucinogenic substance and may be responsible for schizophrenia and other mental illnesses. In what they called the "adrenochrome hypothesis", they speculated that megadoses of vitamin C and niacin could cure schizophrenia by reducing brain adrenochrome. There has been controversy about whether adrenochrome can be classified as a psychotropic drug.

Author Hunter S. Thompson mentions adrenochrome in his book Fear and Loathing in Las Vegas. In the book it is derived from a living donor's adrenal gland  (removing the gland kills the donor; it cannot be taken from a corpse). As such, it is purported to be very exotic, and very intense: if you take it you will hallucinate for several days even up to a week "the first wave felt like a combination of mescaline and methedrine". Thompson reported a significant perceived rise in body temperature that led to paralysis.