Rehmannia glutinosa polysaccharide increases the expression of erythropoietin and vascular endothelial growth factor in rats with chronic renal failure by activating hypoxia-inducible factor-2α Liu H, Su L-L, Ren Y, Wang W-Y. Rehmannia glutinosa polysaccharide increases the expression of erythropoietin and vascular endothelial growth factor in rats with chronic renal failure by activating hypoxia-inducible factor-2α. Pharmacognosy Magazine [Internet]. 2021;17(73):76-83. http://www.phcog.com/text.asp?2021/17/73/76/313484