What is Marvelon?
Marvelon, is what is known as a combined oral contraceptive, because it combines two hormones estrogen and progesterone.
There are a variety of different COCs, with the difference being the specific types of progesterone used, and the dosage level.
For example, Marvelon contains 30 mcg ethinyl estradiol and a progesterone called desogestrel while Alesse contains 20 mcg ethinyl estradiol and a progesterone called levonorgestrel.