Herba Epimedii is one of the most frequently used herbs prescribed for the treatment of osteoporosis in China, and may be used as a complementary and alternative therapy for postmenopausal osteoporosis. Icariin has been found to be the major flavonoids contained in the herb and be responsible for most of its pharmacological activities. However, little is known about the mechanism of this effect. The objective of this study is to investigate the effect of icariin on osteogenic differentiation o...