High levels of oxytocin are mainly found in women or people who are parents: Researchers examined women across their lifespans and found that oxytocin levels were higher in pregnant women and women undergoing fertility treatments than in menstruating women.  Researchers noted that the menstrual cycle phases may impact oxytocin levels in women. Parents and grandparents generally have higher levels of oxytocin. Oxytocin is also known as the “hormone of attachment” since it plays a significant role in the development of attachment triggered by early interaction and contact between infants and their parents.