After years of attempts to develop a male pill, researchers reported success in an advanced research phase testing a new gel that reduces sperm count and prevents fertilization. The results of the research were presented at the Endocrine Society's conference held this week in Boston. The new development, called Nestron, included a type of synthetic hormone already used as a contraceptive in vaginal rings for women, combined with the male hormone testosterone.
The combination is designed to prevent men from producing sperm without affecting libido or causing other side effects. In the trial, 222 men - aged 18 to 50 - applied 5 milliliters of the gel (equivalent to a teaspoon) on each of their shoulders once a day. The participants were required to be in monogamous relationships and needed the consent of their partners.
The participants also had to agree to use the gel as their sole contraceptive method and at least once a month for a year. During the study, the men underwent periodic sperm count tests, which were a good predictor of fertility for this experiment; If the sperm count remains low, the risk of pregnancy is minimal. The results showed that after 12 weeks of daily application, 86% of participants experienced a , from around 15 to 200 million per milliliter, to a level below a million sperm, which is the effective level to prevent spontaneous pregnancy.
The second part of the study is still ongoing, and researchers aim to examine, among other things, the safety of th.
