A contraceptive vaccine is a form of birth control that works by stimulating the immune system to produce antibodies that block or neutralize specific reproductive hormones. Other synonyms for this type of vaccine include fertility control vaccine, contraceptive immunization, anti-fertility vaccine, and birth control shot. These vaccines can be administered to both men and women, and are being developed as a way to provide long-term contraception without the need for daily pills or devices. While still in the experimental stage, contraceptive vaccines have shown promising results and offer an alternative option for those seeking effective and convenient birth control.