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Oxytocin

(Love Hormone)

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What is it?

 

Widely referred to as the love hormone, oxytocin has also been dubbed the hug hormone, cuddle chemical, moral molecule, and the bliss hormone due to its effects on behavior, including its role in love and in female reproductive biological functions in reproduction.

 

What is oxytocin, and what does it do?

 

Oxytocin is a hormone that is made in the brain, in the hypothalamus. It is transported to, and secreted by, the pituitary gland, which is located at the base of the brain.1

In chemistry, oxytocin is classed as a nonapeptide (a peptide containing nine amino acids), while its biological classification is as a neuropeptide. It acts both as a hormone and as a brain neurotransmitter.

 

The release of oxytocin by the pituitary gland acts to regulate two female reproductive functions:

 

Childbirth

Breast-feeding.

 

The release of the hormone during labor increases uterine motility, making the muscles of the uterus (womb) contract. The release of oxytocin is triggered by the widening of the cervix and vagina during labor, and this effect is in turn increased by the subsequent contractions.

The main role of oxytocin is summed up nicely in a research paper by obstetric and gynecology specialists Navneet Magon and

Sanjay Kalra:

"It is released in large amounts during labor, and after stimulation of the nipples. It is a facilitator for childbirth and breast-feeding."

 

Stimulation of the nipples results in oxytocin release and milk let-down.

Other researchers sum up the reproductive importance of oxytocin by saying it "serves the continued propagation of a species," adding that through evolution its "repertoire has expanded to maintain a central role in more complicated aspects of reproductive behavior. For these reasons, we call oxytocin the great facilitator of life."

 

Oxytocin, used as a prescription drug, is sold under the brand name Pitocin (and Syntocinon, although this is no longer on the market).

 

Doctors prescribe oxytocin to start birth contractions or strengthen them during labor. It is also used to reduce bleeding after child delivery.4,5 The drug also has a role in the medical termination of pregnancy or during miscarriage.5

 

Fast facts on oxytocin

 

Here are some key points about oxytocin. More detail and supporting information is in the main article.

 

Oxytocin is a neuropeptide produced in the hypothalamus and secreted by the pituitary gland.

Oxytocin is released during sex, childbirth and lactation to aid reproductive functions.

This neuropeptide exerts multiple psychological effects, influencing social behavior and emotion.

Oxytocin is prescribed for a variety of obstetric and gynecological reasons, including to aid in childbirth.

High levels of the "love hormone" have been observed in couples in the first six months of a relationship.

Oxytocin has an anti-anxiety (anxiolytic) effect and may increase romantic attachment and empathy.

Research shows that oxytocin may have beneficial effects for people with autistic spectrum disorders.

Oxytocin appears to play a role in protecting the intestine from damage, with potential for use in treatment of irritable bowel disease.

 

Oxytocin's effects on emotion

 

Oxytocin released into the bloodstream affects the uterus and lactation, but its release into defined regions of the brain also affects emotional, cognitive, and social behaviors.

One review of the evidence says oxytocin "has attracted intense attention" after the discovery of its "amazing variety of behavioral functions."

The review, by Inga Neumann, states that oxytocin's impact on "pro-social behaviors" and emotional responses contributes to:6

 

Relaxation

Trust

Psychological stability.

 

However, another review notes that the hormone does not act alone in the chemistry of love, but is "just one important component of a complex neurochemical system that allows the body to adapt to highly emotive situations."

 

Oxytocin has been the focus of research into the biology of love. Another review has also sounded caution, calling for research to look more to the general effects than to the specific effects of oxytocin that are being interpreted.

 

"After all, it is rather unlikely that any widely acting hormone or neurotransmitter will be narrowly funneled to modulate complex, high-order mental processes that are specific to social cognition," say the authors of a 2013 paper.

Scientific research has nonetheless uncovered brain oxytocin's specific ability to modulate social behavior, including effects on motherly care and aggression, bonding between couples, sexual behavior, social memory, and trust.

Brain oxytocin also reduces stress responses, including anxiety - and these anxiolytic effects have been demonstrated in a number of species.

One of the so-called 'love hormone' studies was published in 2012, and it examined oxytocin levels in new lovers versus those in single people. It found that there were high levels of the hormone in the first stages of romantic attachment, and that these were sustained for six months.

 

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