In the Balbach lab, researchers like graduate student Macy Jenks (R) are helping push the boundaries of reproductive metabolism. (Finn Gomez & Paul Henderson via SWNS) By Talker

By Stephen Beech

A major discovery has paved the way for a male contraceptive pill , say scientists.

The molecular “switch” that "supercharges" sperm for their final sprint to an egg has been pinpointed by American researchers.

They say their findings could "reshape" infertility treatments and opened the door to safe, non-hormonal male contraceptives .

Study senior author Dr. Melanie Balbach said: " Sperm metabolism is special since it’s only focused on generating more energy to achieve a single goal: fertilisation."

She explained that, before ejaculation, mammalian sperm rest in a low-energy state.

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