Oxytocin is a nano peptide hormone that is produced by the posterior pituitary gland. In women, this hormone is released in large amounts during the process of childbirth to stimulate the uterine muscles to contract. Other factors such as nipple stimulation and breastfeeding can also increase the secretion of oxytocin in women. Both men and women also release the hormone during skin- to-skin contact, sexual arousal, and orgasm/ejaculation. Moreover, oxytocin plays a major role in different human behaviors such as trust, bonding, desire, and social recognition. Because of this, oxytocin is called the “cuddle” or “love” hormone.
Oxytocin is produced in the hypothalamus. The posterior pituitary gland then secretes the hormone into the bloodstream. Oxytocin travels to the uterus and increases both the intensity and frequency of contractions. This in turn speeds up the delivery of the baby and the placenta and reduces the risk of heavy bleeding. In men, oxytocin is also present and plays a role in sperm transport and testosterone production by the testes. The health benefits of oxytocin go beyond these mechanisms. For instance, oxytocin can help promote weight loss by stimulating the breakdown of fat. It can also help keep blood sugar within normal limits by boosting the body’s response to the hormone insulin (insulin sensitivity).
Oxytocin can help slow down the signs of aging by preventing the release of proinflammatory cytokines, which may speed up the process of skin aging via inhibition of collagen synthesis and enhanced collagen degradation.  Since collagen is responsible for maintaining the structures of the skin, decreased collagen levels may contribute to the formation of fine lines, wrinkles, and other age-related spots. Oxytocin can also help alleviate age-related changes in cell structures.
A number of convincing evidence support the anti-aging effects of oxytocin:
Oxytocin has the ability to promote weight loss by reducing food consumption and increasing energy expenditure.  It does this by affecting certain chemicals in the brain that increase the feelings of fullness or satiety. With increased energy expenditure, no additional fat will be stored in the body. Instead, the stored fats will be burned as a source of energy for various cellular activities.
Evidence suggests that oxytocin administration can help increase lean muscle mass and reduce body fat percentage:
The stress response consists of a series of events in the brain that stimulate the hypothalamic–pituitary–adrenal (HPA) axis. When activated, the HPA axis stimulates the release of corticotropin-releasing factor (CRF), a peptide hormone involved in the stress response. CRF promotes the production and secretion of glucocorticoids in response to stress. Oxytocin has been shown to fight stress by inhibiting ACTH and subsequent glucocorticoid secretion. [37-38]
A number of studies support the anti-stress properties of oxytocin:
As one of the feel-good hormones, oxytocin can produce a calming effect which can positively affect the overall mood. By decreasing the levels of the stress hormone cortisol, oxytocin may produce anti-anxiety and antidepressant effects. 
The mood-boosting effects of oxytocin are backed by a number of studies:
Oxytocin is necessary for optimum brain function since brain regions that are crucial for higher cognitive functions such as the prefrontal cortex and the hippocampus have large amounts of oxytocin receptors. [65-66] In addition, oxytocin has also been found to enhance the transmission of nerve signals necessary for vital cognitive processes such as learning and memory. 
There’s a wealth of evidence showing that oxytocin has a significant effect on various cognitive abilities:
Oxytocin plays an integral role in social bonding. Also known as the “love hormone”, it is involved in the regulation of emotions and acts as a chemical reward in the brain during various social interactions. Since many oxytocin receptors are distributed in various brain regions, this hormone may play a role in regulating social behaviors. [80-81]
Studies show that oxytocin can help address impaired social skills due to various medical conditions:
Oxytocin may exert beneficial effects in elevated blood pressure or hypertension. Several mechanisms associated with the blood pressure-lowering effects of oxytocin include dilation of the blood vessels, excretion of the electrolyte called sodium, and increased urine excretion. 
Evidence suggests that oxytocin administration may help lower blood pressure in people with hypertension:
Oxytocin may help protect against cardiovascular disease. It exerts cardioprotective effects by promoting the formation of new blood vessels in the heart, reducing proinflammatory cytokines and immune cell infiltration, decreasing oxidative stress, preventing heart muscle enlargement, and increasing the viability of heart cells (cardiomyocytes). 
A compelling number of evidence suggests that oxytocin may significantly lower the risk of cardiovascular disease:
Oxytocin may be beneficial in the treatment of various inflammatory conditions. This hormone can ward off these conditions by suppressing the production of inflammatory substances and signaling pathways involved in the body’s natural inflammatory response.
The anti-inflammatory properties of oxytocin are backed by a number of studies:
Oxytocin plays an integral role in reward, stress, social affiliation, and various cognitive functions. Because of this, there is increasing interest in this hormone as a potential therapeutic option for substance addiction. There are several mechanisms that can help reduce substance cravings. Oxytocin does this by increasing the levels of brain chemicals (neurotransmitters) such as dopamine and serotonin. [136-137] Dopamine regulates the brain’s pleasure and reward systems while serotonin regulates appetite, mood, and body temperature.
An increasing number of studies support the beneficial effects of oxytocin on substance addiction:
Also known as the “love hormone”, oxytocin increases bonding and sexual intimacy. The more oxytocin the body produces, the more physical intimacy is experienced. In addition, oxytocin has been found to facilitate penile erection in men by increasing the levels of nitric oxide, a substance that widens the blood vessels to increase penile blood flow.  In women, oxytocin can help relieve unpleasant age-related symptoms such as vaginal dryness and painful sexual intercourse. 
A good deal of evidence suggests that oxytocin administration can help improve sexual function in men and women experiencing sexual health issues due to aging and other medical conditions:
Oxytocin can help keep blood sugar within normal limits by boosting the body’s response to the hormone insulin known as insulin sensitivity. Another mechanism is that oxytocin increases the rate of blood sugar uptake, which allows cells to utilize blood sugar effectively for various important biological functions. 
Studies show that oxytocin administration can help improve blood sugar levels:
Oxytocin is also a sleep-promoting hormone. This is because it has calming, anti-anxiety, and antidepressant effects that can help induce sleep. In addition, oxytocin improves sleep quality by counteracting the effects of the stress hormone cortisol. 
The beneficial effects of oxytocin on sleep quality are supported by a number of studies:
Oxytocin side effects are very uncommon. There have been some side effects associated with the use of this drug wherein the patient had one of the issues listed below at some point while being on oxytocin. However, these side effects weren’t confirmed to be associated with the treatment and could have been a coincidence and not related to the use of oxytocin. Despite this, it was listed as a side effect associated with oxytocin even though these associated side effects are very uncommon.
Side effects associated with oxytocin may include the following:
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