Abstract
Chronic treatment with L-tryptophan (4 g/day) reduced mean blood pressure in 8 of 9 patients with mild to moderate essential hypertension. No significant side effects of treatment were observed. An additional group of 8 patients was treated chronically with L-5-hydroxytryptophan (800 mg/day), the immediate precursor of serotonin. Five of the 8 patients had a significant reduction in mean arterial pressure. No significant side effects of treatment were observed. The reduction of blood pressure accompanying treatment with L-5-hydroxytryptophan suggests that at least a portion of the antihypertensive effect of L-tryptophan is mediated via serotonin.
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