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Daniel Kelly, Senior Lecturer in Biochemistry, Sheffield Hallam University

Can a tar-like substance that oozes out of Himalayan rocks really boost your testosterone levels?

Shilajit, Himalayan rock ooze. StockImageFactory.com/Shutterstock.com

Shilajit is the latest supplement marketed online as a “natural testosterone booster”. Promoted by influencers, wellness brands and biohacking communities, this sticky black resin is advertised as a way to increase testosterone, improve energy and enhance male vitality.

Shilajit is a tar-like substance formed over centuries from decomposed plant material compressed within rock in high-altitude regions such as the Himalayas. It has a long history of use in traditional Ayurvedic medicine, where it has been described as a rejuvenator and as an anti-aging compound.

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