Does a diet patient find it helpful?

Hello. As I get older, I continue to gain belly fat and have poor blood circulation, which worries me. I found that there are many diet pills these days, and I am curious if they are effective. I have also tried herbal medicine and acupuncture before, but they did not have much effect. What ingredients are used to make diet pills? Also, I am curious if there are any side effects depending on one's constitution. I am worried because I have had experiences where taking the wrong medication made my condition worse.