Phenformin (Phenethylbiguanide) hydrochloride (Standard) is the analytical standard of Phenformin hydrochloride (HY-16397). This product is intended for research and analytical applications. Phenformin hydrochloride (Phenethylbiguanide) is an orally active biguanide hypoglycemic agent. Phenformin hydrochloride inhibits mitochondrial respiratory chain complex I, leading to an increased AMP/ATP ratio, activation of AMPK, and subsequent inhibition of the mTOR pathway, thereby suppressing cell proliferation, inducing apoptosis and autophagy. Phenformin hydrochloride inhibits cancer stem cells (CSCs) and possesses potent antitumor potential.