DMAU, or dimethandrolone undecanoat, works like the female birth control pill that has been around since the 1960s. It contains a mix of hormones, like androgen, testosterone and progestin, that suppress testosterone and sperm count.
Researchers studied 100 men, who took varying doses of the pill some of which took a placebo. The sperm counts of the men not administered a placebo were sufficiently suppressed, indicating the pill was an effective form of male contraception.
"Despite having low levels of circulating testosterone, very few subjects reported symptoms consistent with testosterone deficiency or excess," the study's senior investigator, Dr. Stephanie Page, a professor of medicine at the University of Washington, said at the Endocrine Society's annual conference (sounds like a party).
"DMAU is a major step forward in the development of a once-daily 'male pill,'" Page said. "Many men say they would prefer a daily pill as a reversible contraceptive, rather than long-acting injections or topical gels, which are also in development."
Some participants did experience a minor dip in in their HDL ("good") cholesterol and some weight gain. All reported healthy liver and kidney function, a concern for some testosterone supplements.
If men are willing to fire blanks, it could be a revolution in safe sex. But please dudes, still wrap it up.