What does Oxytocin do? Benefits and evidence

Oxytocin is a hormone used in hospitals to stimulate labour and control bleeding after birth. Larger nasal-spray trials found no benefit over placebo for social functioning in children with autism or weight loss in adults with obesity. Injection and nasal doses are not interchangeable. Too much can cause dangerous contractions, heart effects or low sodium.

• Pitocin is approved as a hospital injection to start or help labour and to control bleeding after birth. (Drug label)
• In a study of 29 couples, some measures of orgasm improved with nasal oxytocin, though desire and arousal did not change. (Studied in a trial)
• In a trial in people with frontotemporal dementia, on-and-off nasal doses slightly reduced apathy. (Studied in a trial)
• One user reported less social anxiety and another less dislike of being touched; others noticed little effect. (Reported by users)

Uses in the sources

• Approved hospital injections start or support medically indicated labour, aid selected abortion care and control bleeding after birth. (Drug label) (source)
• Nasal oxytocin has been studied for autism. Large trials and the 2026 pooled review found no reliable overall social benefit. (Studied in a trial) (source)
• Acute studies sometimes reduce one meal. The larger 8-week trial found +0.20 kg with oxytocin versus +0.26 kg with placebo. (Studied in a trial) (source)
• A 29-couple study found no change in drive, arousal, erection or lubrication. Some subjective orgasm measures improved. (Studied in a trial) (source)
• Studied for feeding in Prader-Willi syndrome and apathy in frontotemporal dementia. Benefits were limited to selected outcomes. (Studied in a trial) (source)
• People report nasal sprays and injections for bonding, mood or sleep. Reports include no effect, flushing and severe nausea or dizziness. (Reported by users) (source)