Oxytocin is a mammalian neurohypophysial hormone that acts primarily as a neuromodulator in the brain. It plays a strong role in sexual reproduction, also with childbirth both before and after. It has applications of inducing childbirth, off label use include increasing breast milk production, it is also a hormone found extremely important in social cognition and body language reading/calibration in the mammalian brain, and by extension the human brain.
Oxytocin is found to be low in levels in people with social anxiety or autistic spectrum disorders. Women generally have more Oxytocin which explains their heightened emotions and sensitivity to tactile touch in comparison to men, it also attributes to why women tend to be better with reading emotions and find it easier in roles of communication.
Clinical research has proven that Oxytocin can be infranasal lay administrated to improve facial reading abilities and normal social cognitive function to people who have impaired.
It should be noted that autistic people do not lack empathy, they just lack the immediate ability to read human social signals, but they feel often emotions far more intensely than normal humans.