The goal of this clinical trial is to examine whether consumption of dark chocolate affects blood pressure and a cardiovascular risk factor called trimethylamine N-oxide in Thai male participants with hypertension. The main questions it aims to answer are: Can consumption of dark chocolate lower blood pressure? Can consumption of dark chocolate lower blood trimethylamine N-oxide? Researchers will compare dark chocolate to white chocolate to see if the effects are due to theobromine (a key bioactive compound in dark chocolate). Participants will consume either 100 g 72% dark chocolate bar or 80 g white chocolate bar daily for 14 days, rest for 7 days, and then switch to the other type of chocolate.