After decades of attempts to develop new birth control medications for men, scientists are more hopeful than ever. With new abortion restrictions, demand is growing, experts say.

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On Sunday, at the Endocrine Society’s conference in Boston, researchers with the National Institutes of Health’s Contraceptive Development Program presented encouraging phase 2 trial results on the hormonal gel.

The trial involved 222 men, ages 18 to 50, who applied 5 milliliters of the gel (about a teaspoon) to each of their shoulder blades once per day.

The second part of the two-part trial is still underway. Initial findings showed that the contraceptive worked faster than expected, according to Diana Blithe, chief of NIH’s Contraceptive Development Program.

After 12 weeks of applying the gel every day, 86% of trial participants achieved sperm suppression, meaning they had only up to 1 million sperm per milliliter of semen, the amount the researchers deemed effective for contraception. On average, the timing for effective contraception was eight weeks.