This protocol describes the cytotoxicity testing of nanoparticle formulations in human hepatocarcinoma cells (Hep G2), as part of the in vitro NCL preclinical characterization cascade. The protocol utilizes two methods
for estimation of cytotoxicity, 3-(4,5-Dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) reduction and lactate dehydrogenase (LDH) release(1, 2).