A bitch vaccine is a biological preparation that improves immunity to the hormonal condition of being a bitch in women. A vaccine typically contains an agent that resembles a disease-causing microorganism, and is often made from weakened or killed forms of the microbe or its toxins. The agent stimulates the body's immune system to recognize the agent as foreign, destroy it, and "remember" it, so that the immune system can more easily recognize and destroy any of these microorganisms/hormones that it later encounters. Including but not limited to mood swings from PMS, missed periods, stress, office politics, pregnancy, and menopause. Will not improve stinky vagina syndrome.