Can I lose weight healthily with herbal diet medicine?

I lost about 20 kilograms in my 20s through weight training and diet management, but lately, perhaps because I’m getting older, I can’t seem to lose weight even when I exercise.

Of course, I'm barely managing to keep up because I'm not managing my diet well, but I see a lot of herbal diet medicines coming out these days.

It seems like it would be the least harmful to health.

I am curious about the effectiveness of diet herbal medicine and if it has fewer side effects.