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Reversible, Long-Lasting Male Contraceptive Successfully Tested on Rhesus Monkeys – Snopes.com

On 7 February 2017, the scientific journal Basic and Clinical Andrology published the test results of an experimental form of reversible male contraception, an injectable gel (Vasalgel) that acts as a barrier to sperm, which was tried out on rhesus monkeys:

This concept is similar to an approach known as RISUG (Reversible Inhibition of Sperm Under Guidance), which has been subject to human trials in India. RISUG, unlike Vasalgel, does not completely block the vas deferens, and instead lines it with a chemical that compromises the viability of sperm that pass through it. In this paper, researchers described Vasalgel’s proposed mechanism of action as a simple barrier:

Vasalgel™ is a high molecular weight polymer being developed in the US as a contraceptive device for men. Vasalgel is an SMA acid polymer dissolved in DMSO (dimethyl sulfoxide),…

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