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• W1997013485 abstract "Hypericum perforatum L. (St. John's Wort) is a complex herb that has been used for centuries for its putative medicinal properties, and has current therapeutic relevance as a treatment of mild to moderate depression. Recently, two studies in rodents have suggested that hypericum may also have memory-enhancing effects. It has a complex pharmacology, in that acute administration modulates numerous neurotransmitter systems that have previously been observed to either augment or impair a variety of memory processes in humans. This study aimed to examine whether acute administration of standardized hypericum extract could exert a nootropic effect in normal human subjects. The study employed a double-blind, crossover, repeated-measures design. Twelve healthy young subjects completed the Cognitive Drug Research (CDR) memory battery, following administration of placebo, 900 mg and 1800 mg hypericum (Blackmore's Hyperiforte). The findings suggested that hypericum does not have an acute nootropic effect in healthy humans at these doses. However, there was some evidence for an impairing effect on accuracy of numeric working memory and delayed picture recognition at the higher dose. This observed impairment could be due to a sensitivity of these specific tasks to modulation by neurotransmitters that have been noted to have memory-impairing effects (e.g. y-aminobutyric acid (GABA), serotonin)." @default.
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• W1997013485 date "2001-05-01" @default.
• W1997013485 modified "2023-09-26" @default.
• W1997013485 title "An investigation into the acute nootropic effects of Hypericum perforatum L. (St. Johnʼs Wort) in healthy human volunteers" @default.
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• W1997013485 doi "https://doi.org/10.1097/00008877-200105000-00003" @default.
• W1997013485 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11485054" @default.
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