K4 Elite
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A nine-amino-acid cyclic neuropeptide hormone produced in the hypothalamus, extensively studied for its roles in social behavior, bonding, uterine contraction, and milk ejection via the oxytocin receptor.
Oxytocin is a nonapeptide (nine-amino-acid) hormone and neuropeptide synthesized primarily in the paraventricular and supraoptic nuclei of the hypothalamus and released from the posterior pituitary. Its structure includes a characteristic disulfide bridge forming a six-residue ring, and it differs from the related peptide vasopressin by only two amino acids.
Physiologically, oxytocin is classically associated with uterine smooth-muscle contraction during parturition and the milk-ejection reflex during lactation. Beyond these roles, decades of neuroscience research have examined its involvement in social recognition, pair bonding, trust, and stress modulation.
Oxytocin is one of the most thoroughly characterized peptide hormones, with an extensive literature spanning endocrinology, reproductive biology, and behavioral neuroscience. It is supplied here as a research reagent.
Oxytocin acts through the oxytocin receptor (OXTR), a G-protein-coupled receptor coupled primarily to Gq/phospholipase C signaling. Receptor activation raises intracellular calcium, which in smooth muscle drives contraction and in secretory tissue supports milk ejection.
In the central nervous system, oxytocinergic projections and OXTR expression in regions such as the amygdala and hypothalamus underlie its studied roles in social and emotional processing. Oxytocin shows some cross-reactivity with vasopressin receptors, a factor researchers account for when interpreting behavioral studies.
These summarize published clinical and preclinical research for reporting purposes only and are not directions for use.
Controlled behavioral neuroscience studies have administered intranasal oxytocin to human volunteers and measured outcomes such as trust and social behavior; Kosfeld and colleagues (2005) reported that intranasal oxytocin increased trust in an economic-exchange task in a laboratory setting.
In reproductive physiology, oxytocin's role in labor has been studied extensively, and it is a well-characterized uterotonic in obstetric research literature. Preclinical work in voles and rodents has been foundational to understanding oxytocin's contribution to social attachment.
Combinations examined in the research literature. Descriptive only — not a recommendation to combine compounds.
References are being compiled for this entry.