Several small-scale studies involving 15 or fewer test subjects conducted in the 1950s and 1960s reported that adrenochrome triggered
psychotic reactions such as
thought disorder and
derealization. In 1954, researchers
Abram Hoffer and
Humphry Osmond claimed that adrenochrome is a
neurotoxic,
psychotomimetic substance and may play a role in
schizophrenia and other mental illnesses. In what Hoffer called the "adrenochrome hypothesis", he and Osmond in 1967 speculated that
megadoses of
vitamin C and
niacin could cure schizophrenia by reducing brain adrenochrome. The treatment of schizophrenia with such potent anti-oxidants is controversial. In 1973, the
American Psychiatric Association reported methodological flaws in Hoffer's work on niacin as a schizophrenia treatment and referred to follow-up studies that did not confirm any benefits of the treatment. Multiple additional studies in the United States, Canada, and Australia similarly failed to find benefits of megavitamin therapy to treat schizophrenia. The adrenochrome theory of schizophrenia waned, despite some evidence that it may be
psychotomimetic, as adrenochrome was not detectable in people with schizophrenia. In the early 2000s, interest was renewed by the discovery that adrenochrome may be produced normally as an intermediate in the formation of
neuromelanin. Adrenochrome is also believed to have
cardiotoxic properties. == Conspiracy theories ==