Now you know I prefer studies conducted on human participants instead of rodents, but often there is no choice. A Japanese study on rats that you can read here: http://jn.nutrition.org/content/131/8/2150.short has demonstrated pretty convincingly that garlic supplementation significantly increases testosterone. I wish there were more tests on humans but it turns out garlic isn’t patentable (sorry Monsanto) which means there isn’t enough financial interest to warrant human studies. Maybe I’ll conduct one. Any volunteers?