Shilajit, the Himalayan "mountain tar" sold as a natural testosterone booster, was put through a randomized, double-blind, placebo-controlled trial. In men aged 45 to 55, 250 mg of purified Shilajit twice daily for 90 days significantly raised total testosterone, free testosterone and DHEAS versus placebo, while LH and FSH stayed stable. The study is promising but modest, limited to middle-aged men, and reports hormone levels rather than gym performance. Here's what the research shows, what it doesn't, and why purity and heavy-metal testing matter when buying.
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