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Psychedelics Alcohol and Drug Foundation Shaw and Woolley later modified their hypothesis to include the possibility that LSD might mimic the actions of serotonin. Numerous studies in the subsequent decade examined the possibility that LSD blocked the actions of serotonin, but it was a concept that proved untenable. It was clear, however, that LSD did have a potent effect on brain serotonin systems, elevating whole brain serotonin content and reducing brain levels of the major metabolite of serotonin, 5-hydroxyindole acetic acid (Rosecrans et al., 1967). By way of illustration, in 1952, there were only 10 publications in the National Library of Medicine concerning serotonin, nearly all of them dealing with some aspect of its ability to constrict blood vessels. Only 8 years later, in 1960, there were 300 publications on serotonin, 35 of which were now focused on studies of serotonin in the brain. Borderline personality disorder is a high-risk model for studying suicidal behavior and