A chemical found in the khat plant could boost the power of men's sperm, researchers have found.
Lab tests by King's College London found treated sperm became fertile faster, and stayed fertile for longer, than untreated sperm.
Khat is mild narcotic, producing a high when chewed, but its use has been linked to long-term problems.
The study was presented at the European Society of Human Reproduction and Embryology conference in Berlin.
The researchers say their findings could lead to products to help couples conceive.
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