Actually, studies show that the opposite holds true — that regular consumption of melatonin in fact lowers blood pressure. In particular, I am referring to a study conducted in 2004 by a joint venture between Harvard Medical School and ‘Brigham and Women’s Hospital: Boston Hospital & Medical Center.’ The researchers distributed melatonin to sixteen men suffering from hypertension and then tracked their blood pressure over the course of a few weeks 1.
Here’s the problem. The researchers weren’t able to determine whether the reduction in blood pressure occurred as a direct result of the melatonin or as a result of the better sleep provided by the melatonin. Regardless, the final premise remains the same:
No, melatonin CANNOT increase blood pressure.
- http://www.drweil.com/drw/u/id/QAA326424 ↩