History
In 1906 British physiologist Henry Dale found that pituitary extract made a cat's uterus contract; the active substance was named oxytocin, from the Greek for "swift birth." In 1953 American chemist Vincent du Vigneaud worked out its nine-amino-acid structure and made it in the lab, the first peptide hormone ever synthesized, earning the 1955 Nobel Prize in Chemistry. Synthetic oxytocin, sold in the US as Pitocin, remains an essential drug for inducing labor and stopping postpartum bleeding.
Roles in body and mind
When a baby nurses, oxytocin triggers the milk-ejection reflex, and during labor it strengthens contractions. In the 1990s Sue Carter and Thomas Insel showed that monogamous prairie voles have dense oxytocin receptors, opening research on pair bonding and attachment. In 2005 a Swiss team reported in Nature that a nasal spray of oxytocin made people more trusting in an investment game, and the "trust hormone" nickname took off. Hugs and touch are thought to release oxytocin alongside dopamine reward signals, reinforcing bonds.
Hype and limits
By the 2010s many nasal-spray studies were criticized as small and hard to replicate, and the trust effect itself held up poorly. Some findings suggest oxytocin boosts warmth toward one's own group but wariness toward outsiders, so it's no simple love potion. Hopes for treating autism faded when a large 2021 trial found no benefit. Researchers are studying links between low oxytocin and postpartum depression, and it appears to dampen the stress hormone cortisol.
This article is general health information and is not a substitute for diagnosis or treatment. If symptoms persist, see a doctor.
FAQ
- How can you raise oxytocin?
- Physical touch and social connection, such as hugs, massage, close conversation and laughing together, are known to encourage its release.
- Will an oxytocin spray make me trust people?
- That effect hasn't replicated well, and over-the-counter products aren't quality-controlled, so they're not recommended.
Sources reviewed: 2026-10-26
References
- du Vigneaud, V., et al. (1953). The synthesis of an octapeptide amide with the hormonal activity of oxytocin. Journal of the American Chemical Society, 75(19), 4879–4880.
- Kosfeld, M., Heinrichs, M., Zak, P. J., Fischbacher, U., & Fehr, E. (2005). Oxytocin increases trust in humans. Nature, 435, 673–676.
- Walum, H., Waldman, I. D., & Young, L. J. (2016). Statistical and methodological considerations for the interpretation of intranasal oxytocin studies. Biological Psychiatry, 79(3), 251–257.