Most people have a basic understanding of how fluctuations in testosterone and estrogen affect our bodies and overall behavior. Drops in these hormones can cause a significant decline in physical stamina that may affect every facet of your life. However, it’s much less likely that you’ll be familiar with a hormone called oxytocin.

This hormone, which is produced by the brain’s pituitary gland, is directly linked to romantic emotions, as every time you hug or kiss someone you care for, your oxytocin levels rise. It even has the nickname of “the cuddle hormone” because it has been shown to deepen the bond between loved ones, be they a couple or parent and child.

According to a recent press release, researchers from the University of Bonn in Germany conducted a study to further explore the emotional effect of oxytocin on men in relationships, since a previous research showed it promoted monogamy among animals.

To gauge this, the scientists gave a group of men a nasal spray that either contained the hormone or a placebo. After a set period of time, an attractive woman was asked to enter the room. Each male participant was told to specify what they considered to be a comfortable distance between themselves and the female.

“Because oxytocin is known to increase trust in people, we expected men under the influence of the hormone to allow the female experimenter to come even closer,” said lead researcher Dr. René Hurle­mann.

Instead, they found that the men in committed relationships who were given the hormone chose to keep a greater distance between themselves and the woman. The same did not apply for single men that received the oxytocin.

Hormones can have a substantial impact on your behavior and overall attitude toward life. Among the many anti-aging services offered at Longevity Centres of America, the clinic offers hormone pellet therapy to restore youthful levels of estrogen and testosterone to men and women who have lost their exuberance as they’ve aged.