Dietary herbal medicine

Since summer is here, I am more interested in dieting. When doing a diet with traditional medicine, do the effects of decoctions, pills, and acupuncture appear similarly? I wonder if weight loss herbal medicine, which suppresses appetite by providing a feeling of fullness and helps reduce food intake, is safe. Are there any side effects after dieting? I am also curious about how many months of herbal medicine intake are necessary to lose weight.