"Protective role of propolis against reproductive toxicity of triphenyltin in male rabbits…Triphenyltin (TPT) is known to cause endocrine disruption, reproductive toxicity and a decrease in testosterone production. It is involved in the production of reactive oxygen species. Propolis has been reported to be an important antioxidant…Results showed that semen quality was deteriorated following treatment with TPTCl. Also, testosterone levels [decreased]…Propolis alone significantly increased testosterone levels, BW, RTW, REW, semen characteristics and seminal plasma enzymes, and decreased the levels of free radicals and lactate dehydrogenase. Furthermore, the presence of propolis with TPTCl alleviates its toxic effects. From the present study, it can be concluded propolis can be effective in the protection of TPTCl-induced reproductive toxicity.”
(Food Chem Toxicol. 2010 Jul;48)
Propolis is found in the honeycomb, mentioned and eaten in the Bible. It is "bee-glue," and has antiseptic and antioxidant properties. Bees make it from tree sap, etc.
Along with royal jelly, garlic, etc., it appears to be a great way for men to combat the toxic chemical attack upon male hormones, etc.