AUTHOR=Van IJzendoorn Marinus H., Bhandari Ritu , van der Veen Rixt , Grewen Karen , Bakermans-Kranenburg Marian J.

TITLE=Elevated Salivary Levels of Oxytocin Persist More than 7 h after Intranasal Administration

JOURNAL=Frontiers in Neuroscience

VOLUME=6

YEAR=2012

URL=https://www.frontiersin.org/journals/neuroscience/articles/10.3389/fnins.2012.00174

DOI=10.3389/fnins.2012.00174

ISSN=1662-453X

ABSTRACT=<p>We addressed the question how long salivary oxytocin levels remain elevated after intranasal administration, and whether it makes a difference when 16 or 24 IU of oxytocin administration is used. Oxytocin levels were measured in saliva samples collected from 46 female participants right before intranasal administration (at 9:30 a.m.) of 16 IU (<italic>n</italic> = 18) or 24 IU (<italic>n</italic> = 10) of oxytocin, or a placebo (<italic>n</italic> = 18), and each hour after administration, for 7 h in total. Oxytocin levels did not differ among conditions before use of the nasal spray. Salivary oxytocin levels in the placebo group showed high stability across the day. After oxytocin administration oxytocin levels markedly increased, they peaked around 1 h after administration, and were still significantly elevated 7 h after administration. The amount of oxytocin (16 or 24 IU) did not make a difference for oxytocin levels. The increase of oxytocin levels for at least 7 h shows how effective intranasal administration of oxytocin is. Our findings may raise ethical questions about potentially persisting behavioral effects after participants have left the lab setting. More research into the long-term neurological and behavioral effects of sniffs of oxytocin is urgently needed.</p>