Dihydroberberine, a natural product isolated and purified from the tubers of Corydalis decumbens (Thunb.) Pers., has anti-tumor activity. Dihydroberberine improves in vivo efficacy in terms of counteracting increased adiposity, tissue triglyceride accumulation, and insulin resistance in high-fat-fed rodents, thus is potential therapeutic reagents for type 2 diabetes treatment.