Kisspeptin, Oxytocin and PT-141: Three Molecules Behind Love Research (and Where to Get All Three in Canada)
Attraction, bonding and desire run on three different systems in the brain. Kisspeptin, oxytocin and PT-141 each sit on one of them. Here is how they fit together, and where to get all three in Canada.
- Kisspeptin, oxytocin and PT-141 act at three different points of the same system: the reproductive-hormone chain, social bonding and the brain’s melanocortin desire pathway.
- Researching Love? keeps all three together in one box as ready-mixed nasal sprays: $189.99 CAD, a little less than the $199.97 they cost apart.
- Ships tracked from Vancouver by Canada Post Xpresspost, no customs. Sold for laboratory research use only.
The quick answer
Kisspeptin, oxytocin and PT-141 are three peptides that keep turning up in the same research conversations, because each one sits on a different part of what people call love: attraction, bonding and desire. In Canada all three come together, as ready-mixed nasal sprays in one box, in Researching Love?: $189.99 CAD, shipped from Vancouver with no customs.
Three systems, one story
| Kisspeptin | Oxytocin | PT-141 (bremelanotide) | |
|---|---|---|---|
| What it is | A natural brain peptide (kisspeptin-10 is its active fragment) | A natural hormone made in the hypothalamus | A lab-made peptide |
| Where it acts | The top of the reproductive-hormone chain (GnRH) | Oxytocin receptors in the brain and body | Melanocortin receptors (MC3R/MC4R) in the brain |
| What it is studied for | Attraction and reproductive signalling | Bonding, trust and attachment | The brain’s desire pathway |
| Our spray | Kisspeptin 10 mg / 10 ml, $54.99 | Oxytocin 5 mg / 10 ml, $89.99 | PT-141 10 mg / 10 ml, $54.99 |
Kisspeptin: the attraction signal
The KISS1 gene behind kisspeptin was discovered in 1996 at Penn State’s medical school in Hershey, Pennsylvania (yes, it is named after Hershey’s Kisses). It turned out to be the switch at the very top of the reproductive-hormone chain: kisspeptin neurons in the hypothalamus tell the brain to release GnRH, which sets off everything downstream. It also has a human research angle: a brain-imaging study at Imperial College London, where kisspeptin was given by intravenous infusion, looked at how it changes the way the brain processes sexual and romantic images. More in our kisspeptin vs PT-141 explainer.
Oxytocin: the bonding signal
Oxytocin is the famous “love hormone”. The bonding story started with prairie voles, small rodents that pair for life, where oxytocin signalling turned out to be central to partner preference. Human research followed, including the well-known trust experiment. Not every result has held up, and we wrote about that honestly in what oxytocin can’t promise. It is still one of the most-studied molecules in bonding research.
PT-141: the desire signal
PT-141, also called bremelanotide, is a lab-made peptide that works through melanocortin receptors in the brain rather than through blood flow. That central “desire pathway” is what took it into clinical trials, and nasal is where its story began: its early clinical development used an intranasal formulation. More in our PT-141 research guide.
Why study them together
Because the three systems talk to each other. The sex steroids made downstream of the kisspeptin–GnRH chain shape how oxytocin and melanocortin signalling behave. No study has tested the three peptides together yet. That is the open question, and the reason to keep them on one bench: attraction, bonding and desire, three chapters of the same story, read side by side.
What it costs in Canada
Apart, the three sprays come to $199.97 CAD ($54.99 + $89.99 + $54.99). Researching Love? is $189.99: $9.98 less, one box, one shipment. A small difference, on purpose; the reason to keep them together was never the discount. Two more ways to save:
- —Order two boxes and the 10% multi-buy price applies to both, which also takes the order past $300 for free shipping.
- —Pay by Interac e-Transfer and another 10% comes off at checkout.
Research Rewards members can take it free with 2 medals. Membership is free at popularpeptides.ca/members.
All three sprays arrive ready, with nothing to mix and no bacteriostatic water. They are shelf-stable for up to 2 months in dark amber glass bottles: keep them upright, tightly capped and away from heat and sunlight (the fridge is optional). Everything ships tracked from Vancouver by Canada Post Xpresspost, usually in 1 to 4 business days, with no customs step and no brokerage fee.
Look inside Researching Love? →
Frequently asked questions
Can I buy kisspeptin, oxytocin and PT-141 together in Canada?
Yes. Researching Love? is all three as ready-mixed nasal sprays in one box, $189.99 CAD, shipped from Vancouver with no customs.
What is the difference between kisspeptin and oxytocin?
Kisspeptin is the signal at the top of the reproductive-hormone chain. Oxytocin is a separate hormone studied for bonding, trust and attachment. They act on different receptors and answer different research questions.
Is PT-141 the same as oxytocin?
No. PT-141 (bremelanotide) is a lab-made peptide that acts on melanocortin receptors in the brain. Oxytocin is a natural hormone with its own receptor.
How much do you save with all three together?
$9.98 against buying the three sprays separately ($199.97). Ordering two boxes adds the 10% multi-buy price and free shipping.
Do the sprays need to be refrigerated?
No. They are shelf-stable for up to 2 months in their amber glass bottles. The fridge is optional.
Sold for laboratory research use only. Not for human consumption.
We source from distributors whose batches are third-party tested for HPLC purity and measured content. Certificates of Analysis (COAs) are for members only.