I have been on the ring on and off for about 4 years. I am 33 years old and I never had a problem using the ring, I love it!! I wouldn't use any other type of birth control. I've read many of the comments here and to me it's not the ring it's just the way your body reacts to it just like any type of medication. Just because someone may be allergic to a medication does not mean that it does not work. The side effects are listed so if you get them then the ring is not for you. It also warns you that if you should not smoke while on the ring!! If some of the women here smoke while on the ring then that might be another problem. If you are thinking about using the ring don't get discouraged by what other women are saying. Remember, our bodies are all different and the symptoms or side effects will vary.