Is there no health risk with dieting using herbal medicine?

I've gained a lot of weight recently and want to go on a diet.

Walking a ten-thousand steps doesn't seem to show any effects.

Sometimes, traditional Korean medicine clinics hold weight loss herbal medicine events.

I want to do it out of curiosity, but my old friend is on a diet.

I'm taking herbal medicine, but my period hasn't stopped.

I told my younger sibling, and they suggested I try stopping the herbal medicine.

Since I didn't eat, my period stopped from that time onward.

I heard that the side effects have started, so I am dieting.

I realized I can't just take herbal medicine casually. Others do it differently.

Is diet herbal medicine okay?