Safety considerations: ① only GMP-certified herbs used, regular safety testing, ② constitution-based prescription (avoid Mahwang for sensitive populations), ③ regular monitoring at follow-up visits, ④ dose adjustment based on response. Contraindications: ① pregnancy, ② severe hypertension/heart disease, ③ severe liver/kidney disease, ④ children under 18 (special circumstances only). Online or non-certified diet supplements are far less safe. Always consult a licensed Korean medicine doctor.