TOPLINE:

Oxytocin administration, when combined with instructed positive interaction with a partner and physical intimacy, improved wound healing in couples in a randomized trial.

METHODOLOGY:

• A double-blind, randomized, placebo-controlled trial involved 80 healthy heterosexual couples (160 participants; mean age, 27.6 years) who received four small suction-blister wounds on their forearms and completed three laboratory visits.
• Couples were randomly assigned to one of four groups in a 2 × 2 factorial design: oxytocin with a structured Partner Appreciation Task (PAT), oxytocin without PAT, placebo with PAT, or placebo without PAT. The PAT consisted of a 10-minute guided interaction encouraging partners to express appreciation, gratitude, and positive reflections about their relationship, while control couples engaged in unstructured conversation.
• Participants self-administered either oxytocin (24 IU initially, then 32 IU/d) or placebo twice daily for 7 days. They also completed a 5-day ecological momentary assessment via mobile app, reporting their stress levels, partner interactions (including affectionate touch and sexual activity), and daily activities six times per day.
• Researchers assessed wound healing at 24 hours and 7 days post-wounding, while participants provided saliva samples for cortisol analysis and reported stress levels and partner interactions six times daily.

TAKEAWAY:

• Adherence to daily nasal spray among participants was 90%-91%; only 68% completed PAT on 2 or more days; the adverse event rate was 3%-4%.
• Couples receiving oxytocin combined with PAT experienced improved wound healing (b, -0.038; P = .04); oxytocin alone or behavioral intervention alone did not improve healing outcomes.
• Oxytocin administration combined with affectionate touch (b, -0.038; P = .04) or sexual activity (b, -0.145; P = .04) also significantly improved wound healing, suggesting oxytocin amplifies the effects rather than exerting direct effects, according to the authors.
• Increased sexual activity was linked to lower daily cortisol levels (b, -0.083; P = .005).

IN PRACTICE:

“When combined with the PAT…or with everyday intimacy (with more robust effects), oxytocin was associated with faster recovery,” the authors wrote. “These modest, context-dependent effects provide preliminary insights into the neuroendocrine mechanisms through which intimate relationships can improve health, underscoring the need for larger, more diverse trials,” they noted, adding that the data “support the view that oxytocin functions as a social amplifier rather than a standalone therapeutic.”

SOURCE:

The study was led by Ekaterina Schneider, PhD, Institute of Medical Psychology, University Hospital Heidelberg, Heidelberg, Germany, and was published online on November 12 in JAMA Psychiatry.

LIMITATIONS:

Wound healing assessment was limited to only 24 hours and 7 days post-wounding; the PAT had incomplete adherence at 68% and lacked standardized timing. The study population was restricted to young, healthy, heterosexual couples, limiting generalizability to other demographics. Additionally, the beliefs about group assignment were only indirectly assessed, and intimacy measures lacked standardized definitions.

DISCLOSURES:

The study was supported by the Swiss National Science Foundation. The authors reported having no relevant conflicts of interest.

This article was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.