Biological properties and clinical application of propolis. XI. Histophathological analysis after intravenous application of ethanol extract of poprolis (EEP).

Mice were given i.v. injections of water solutions of ethanol extract of propolis (EEP) over a varying period of time. Some of the animals were sacrificed immediately following the last injection and some within 2--4 weeks after the last injections. Internal organ samples were taken and underwent a microscopic examination. Insignificant pathological changes in the liver were observed. These changes were transient and regressed within 2--4 weeks after the application of EEP.