To determine whether daily oral doses of 5-HTP affect the central nervous system by modulating serotonergic receptors.
This randomized, double-blind, placebo-controlled, placebo-controlled study was conducted in 14 men who completed a single 60-day treatment. Subjects completed daily doses of either 25-mg (n=6), 50-mg (n=4), 30-mg (n=7), or 50-mg (n=3) of 5-HTP alone to assess effects on Serotonin and noradrenaline receptors. Subjective mood, cognitive performance, body mass index (BMI) and blood pressure also were assayed.
After an initial 6 h of acute administration of 5-HTP (50-mg), subjects had greater subjective mood (55.8 percent, p=0.004). Mood and body temperature were significantly elevated following the first 30-mg dose, but mood and body temperature returned to baseline following the final 6 h administration (30-mg: p=0.001 and p=0.004, respectively). No significant changes in mood and body temperature were observed in men given the 50-mg dose. There was a decrease in mood in comparison to treatment with the 50-mg dose or placebo. Blood pressure also was significantly increased in men given the 50-mg dose of 5-HTP. No change in blood pressure was observed among subjects receiving the 30-mg dose.
Daily oral 5-HTP administration for one session may produce changes in mood and blood pressure in healthy men and may improve body mass index and cardiovascular health.
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