Oxytocin, the “cuddle hormone”: what the trials actually found
Updated from live data. Research use only. Prices, not recommendations.
Most of oxytocin's reputation rests on small lab studies. The largest trials so far found little or no effect on the outcomes people care about. Here is each popular claim next to the evidence.
Oxytocin is a nine-amino-acid hormone made in the hypothalamus. Hospitals have used it for decades to start and strengthen labor, and in 1955 Vincent du Vigneaud won the Nobel Prize in Chemistry for making it in the lab. The “cuddle hormone” name came later, from research on bonding.
“It makes people trust each other”: a lab effect, and a fragile one
The claim traces to a 2005 Nature study in which men given nasal oxytocin handed more money to a stranger in an investment game. Later attempts to repeat it found smaller effects or none, and recent work points to an effect mostly in people who start out low-trusting. It is a finding about a game in a lab, not about relationships.
“It helps autism”: the biggest trial found no benefit
The SOARS-B trial (New England Journal of Medicine, 2021) gave 290 children and teens with autism daily nasal oxytocin or placebo for 24 weeks. Social skills did not differ between the groups. Earlier small studies were more hopeful, which is why the idea keeps circulating.
“It helps with weight”: appetite signals, no weight loss yet
Brain-imaging studies keep finding that oxytocin quiets the reward response to food pictures. But an 8-week randomized trial in 61 adults with obesity, published in 2024, found no difference in weight between oxytocin and placebo. Our oxytocin and GLP-1 report covers this in more detail.
“It calms social anxiety”: small, situational effects
In one trial, observers rated people with social anxiety as behaving more warmly in a getting-acquainted task after oxytocin, but the participants themselves noticed no change. Other tasks in the same study showed nothing. Larger trials are registered but have not reported.
“It’s safe to use long term”: one reassuring hormone study
A 2026 study of long-term nasal use found reproductive hormones stayed stable. That answers one narrow safety question. It does not show a benefit, and research vials sold online are not the pharmacy product used in trials.
What research-grade oxytocin costs today
Oxytocin is a short peptide, so it is cheap to make. The lowest landed price is $1.35/mg; the typical vendor asks $5.80/mg.
| Peptide | Lowest $/mg | Median $/mg |
|---|---|---|
| Oxytocin12 vendors · lowest at Chimera Peptides | $1.35 | $5.80 |
How we measured this
Prices are each vendor's cheapest live listing: list price plus any shipping estimate, minus the sale and the sitewide code we show on the compare page, divided by total mg. Median is across vendors, one listing each. The research summaries link to the published studies; we report what they found and give no use or dosing guidance.
No vendor pays for placement and none of these numbers is a ranking for sale. Buy links on the pages linked here may earn us a commission. More on how the site works on the about page.