Studies on anti-hyperglycemic effect and its mechanism of Dendrobium candidum Effect of Xiexin Decoction on early diabetic nephropathy in diabetic rats Inhibition of proanthocyanidin-B2 on nonenzymatic glycation of protein in vivo and in vitro Hypoglucemic effect of Huangyu Capsula on diabetic rat model Inhibition of proanthocyanidin-B2 on nonenzymatic glycation of protein in vivo and in vitro Protection of polysaccharides-2b from mudan cortex of Paeonia suffruticosa andr on diabetic cataract in rats