8. After addiction, withdrawal from the use of caffeine can cause mood swings and irritability, similar to the symptoms of withdrawing from a narcotic or alcohol. 9. Consuming as little as 200mg of caffeine every day can lead to addiction and altered chemistry in the brain.
Progestin is a form of progesterone, a hormone that plays a role in the menstrual cycle and pregnancy. Progestin is used in combination with another hormone called estrogen in combined hormonal birth control pills, the vaginal ring, and the skin patch.
Due to the increase in hormonal levels that birth control pills cause, it is normal to experience irregular periods and spotting for a few weeks after starting the pill. And for women taking progestin-only pills, it is not uncommon for them to completely miss their periods.