This Plant-Based Birth Control Could Work for Men—and Replace Plan B

Scientists say they've discovered a way to prevent sperm from burrowing into eggs, and it's totally non-hormonal.
May 17, 2017, 4:30am

The search for a male birth control has been such a tease. Researchers have been struggling for years to develop a working drug, and have so far come up short. The most optimistic prospect is Vasalgel, which has shown to be effective in animal trials. Other seemingly promising alternatives have faced development barriers—last year, for instance, a groundbreaking study on a male contraceptive injection ended early because the participants couldn't handle the annoying side effects, like mood swings and acne.


Researchers at the University of California, Berkeley, have started testing out a new approach. Sperm is able to fertilize an egg thanks to tadpole-like tail that can help it drill into the egg; this motion occurs when the calcium channel of the sperm is activated when it nears the egg and encounters progesterone. The UC Berkeley researchers say they've discovered a way to turn this mechanism, known as CatSper, off.

Read more: The Racist and Sexist History of Keeping Birth Control Side Effects Secret

"Calcium, at high concentrations within the cell, does two very important things. One, it changes the way in which the sperm tail moves, resulting in a much stronger propulsion, which the cell needs to progress through the female reproductive tract and to penetrate the protective outer layers of the egg," Melissa Miller, one of the authors of the study, elaborated. "And two, it stimulates the release of enzymes that help to drill holes in the outer layers of the egg to allow the sperm access to the egg. This cascade of events is triggered, in humans, by the hormone progesterone." Previous studies have found that mutations in certain CatSper proteins are linked with infertility.

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