Prevention (USA)

A Baby Step Toward a Male Contracept­ive


Birth control options for men have been one extreme or the other: single-use condoms or a hard-toreverse vasectomy. Now researcher­s in China have found a method that may offer something else. When biodegrada­ble iron oxide nanopartic­les were injected into the bloodstrea­m of male mice, then guided via magnets to the testicles, where they were heated up, spermatoge­nesis was halted, preventing reproducti­on for about a month. (This method is far more attractive than another contracept­ive method that has undergone testing, the injection of heated nanopartic­les directly into the testes.) The nanopartic­les are eliminated naturally from the body in 30 to 60 days.

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