Does 5 htp cause high blood pressure?

5-HTP does not appear to cause high blood pressure.

A 2016 review study in the Journal of Natural Products did not find any adverse events associated with 5-HTP, including any effects on blood pressure.

Another 2016 study in Nutritional Neuroscience looked specifically at the effects of 5-HTP on blood pressure. The study included 29 adult women who took either 5-HTP or a placebo for 12 weeks. The results showed that 5-HTP did not significantly affect blood pressure compared to the placebo.

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