A form of male contraception that blocks sperm from leaving the body using a gel has shown promise in early clinical trials.Researchers in who injected 23 men with the non-hormonal birth control — called ADAM — said sperm counts in participants' ejaculations dropped by 99 to 100 percent just a month after the procedure.Participants had the gel injected into the vas deferens, the tube that carries sperm from the testes to outside the body.
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