You gotta love the name: TestoJack100. And many people no doubt love the claims: that the supplement "supports male reproductive function and healthy testosterone levels." And while TestoJack100 marketeers don't actually claim that their product boosts testosterone, that message is hard to miss, particularly in the assertion that it is helpful for virility. What's harder to love is the evidence that the stuff does what it's supposed to do, mainly because that evidence is extremely hard to find. The Los Angleles Times reports that TestoJack100 contains a blend of herbs, including Eleutherococcus senticosus, Tribulus terrestris and Eurycoma longifolia, along with zinc, magnesium and vitamin B-6, among other ingredients. Men, who pay pay roughly $20 to $30 for a bottle of 60 capsules, are advised to take two capsules once or twice a day. The paper reports that some of the ingredients in TestoJack have been tested, with less-than-impressive results. In a 2007 study in the Journal of Strength and Conditioning Research, Australian researchers found that giving rugby players daily doses of Tribulus terrestris for five weeks had no effect on their testosterone levels. Wait, there's more. The Times quotes Dr. John Morley, a testosterone expert and director of geriatrics at St. Louis University, who says there's not a lot of scientific evidence for any supplement that claims to boost or "promote" testosterone.
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Saturday, May 31, 2025