With an iud i was told that the hormones do not enter your bloodstream but stay in the uterus, is this true or should i stick with the non-hormonal?

Hormone IUD's: Hormone IUD's usually contain progesterone or its derivatives and in fact do remain inside the uterus to prevent the endometrium(lining of the womb) from growing thereby preventing conception implantation. Contraceptive choices are based on the will and personal preferences of the patient and the desire for levels of effectiveness, in other words-your choice(s).