- OP Labs formerly Oxford Peptides
- Batch HPLC tested at 99%+ purity
- Store frozen long term or in fridge when ready to be used
- Sold for research purposes only
- Contact us for Wholesale Orders
Download COA here: Ipamorelin_COA.pdf
Please note: if you have a different Batch ID please contact us for the latest COA.
Ipamorelin
Synonyms / Designations: Ipamorelin, Ipamorelin Acetate, NNC 26-0161, Ipamorelin pentapeptide
CAS Number: 170851-70-4
Molecular Formula: C38H49N9O5
Molecular Weight: ~711.85 g/mol
Peptide Sequence: Aib-His-D-2-Nal-D-Phe-Lys-NH2
Peptide Classification: Synthetic growth hormone secretagogue; selective ghrelin receptor agonist
Purity: ≥ 99 % (HPLC, typical)
Appearance: White to off-white lyophilised powder
Pack Size: 5 mg
Storage: Desiccated, protected from light, stored at –20 °C
Solubility: Soluble in sterile water and buffered aqueous solutions
Description & Mechanism
Ipamorelin is a synthetic pentapeptide growth hormone secretagogue derived from GHRP-1 through structural optimisation. It was the first selective growth hormone-releasing peptide (GHRP) receptor agonist developed, demonstrating selectivity similar to that of growth hormone-releasing hormone (GHRH) for stimulating growth hormone release.
In biochemical and cellular research systems, ipamorelin acts as an agonist at the ghrelin/growth hormone secretagogue receptor (GHSR-1a) expressed on pituitary somatotroph cells. Unlike earlier GHRP compounds such as GHRP-6 and GHRP-2, ipamorelin exhibits a distinct selectivity profile: experimental studies have demonstrated that it does not release adrenocorticotropic hormone (ACTH) or cortisol at growth hormone-stimulating concentrations. This selectivity makes ipamorelin a valuable research tool for investigating GH secretion pathways independently of hypothalamic-pituitary-adrenal (HPA) axis activation. In animal models, ipamorelin has been reported to induce longitudinal bone growth in a dose-dependent manner under controlled experimental conditions.
Applications in Research
- Investigation of GHSR-1a receptor binding, selectivity, and signalling pathways
- Study of growth hormone secretagogue mechanisms independent of HPA axis activation
- Research into pituitary somatotroph function and GH release dynamics
- In vitro and in vivo comparison with other GHRP compounds (GHRP-2, GHRP-6, Hexarelin)
- Models examining GH/IGF-1 axis regulation and bone growth signalling
- Use as a selective reference compound in neuroendocrine and peptide signalling research
Handling, Reconstitution & Stability
- Weigh under dry conditions; peptide is hygroscopic
- Reconstitute in sterile water or appropriate buffered aqueous solution depending on assay requirements
- Avoid vigorous agitation during dissolution
- Filter sterilize if required (e.g. 0.22 µm) immediately prior to use
- Aliquot and store reconstituted solutions at –20 °C (or lower) to minimise degradation
- Avoid repeated freeze–thaw cycles
Specifications Summary
Purity (HPLC): ≥ 99 %
Appearance: White to off-white lyophilised powder
Peptide Type: Synthetic growth hormone secretagogue (GHSR-1a agonist)
Molecular Formula: C38H49N9O5
Molecular Weight: ~711.85 g/mol
Solubility: Water, buffered aqueous solutions
Storage: –20 °C, desiccated, protected from light
Pack Size: 5 mg
Precautions & Notes
- Experimental behaviour of ipamorelin is influenced by receptor expression, concentration, and exposure duration
- Unlike GHRP-6 and GHRP-2, ipamorelin does not stimulate ACTH or cortisol release at GH-stimulating concentrations
- Buffer composition, pH, and ionic strength may affect peptide stability and assay performance
- Appropriate controls are recommended to distinguish receptor-specific from non-specific effects
- Intended strictly for laboratory research use; not for human or veterinary application
References
Raun K. et al. Ipamorelin, the first selective growth hormone secretagogue. European Journal of Endocrinology, 1998.
https://pubmed.ncbi.nlm.nih.gov/9849822/
Sinha D.K. et al. Beyond the androgen receptor: the contribution of growth hormone secretagogues to changes in body composition. Growth Hormone & IGF Research, 2020.
https://pmc.ncbi.nlm.nih.gov/articles/PMC7108996/
Johansen P.B. et al. Ipamorelin, a new growth-hormone-releasing peptide, induces longitudinal bone growth in rats. Growth Hormone & IGF Research, 1999.
https://pubmed.ncbi.nlm.nih.gov/10373343/
Keywords: Ipamorelin, Ipamorelin Acetate, NNC 26-0161, Growth Hormone Secretagogue, GHSR-1a Agonist, Ghrelin Receptor Agonist, Selective GHRP, Synthetic Peptide, Neuroendocrine Research









David Moir –
Works best at night fasted 2 hours before bed.
Anonymous –
Anonymous –
Brendan (verified owner) –
Anonymous (verified owner) –
It’s good for sleep and gh
Anonymous –
Anonymous –
Good quality and effective.
Karen P. –
Anonymous –
Wendy Jane E. –
Excellent product
Steve Walters –
Excellent product
Susan Turner –
Tom –
Perfect
Glen –
Ordering was EASY.. delivery was immediate.. THANK YOU.. I’ll be using your amazing products & services regular
Troy Wear –
I havent tried it yet but your service, speed of delivery and packaging where all excellent
Nigel Royston –
Good compound, would like to see 99% purity though
Bryn Anderson –
Reece Byfield –
Andrew C. –
chen yu tsang –
very good product and service
Anonymous –
Anonymous –
Darius J. –
Great communication.
Dan Cooper –
Always fast delivery and seen great results
Gavin –
Amazing results
C K. –
Rory C. –
High quality product as always
Justin –
Great product and very timely delivery.
Sebastian Schreiber –
Anonymous –
Excellent. Used at 500mcg/day in combination with CJC1295 200mcg/day
Jamie M. –
Brilliant product
Marcin –
Great product. I’ve used oxford peptides for over a year now and it’s the only one worth attention. Might sound like an ad but I’m just being honest. Very effective compared to competition.
Ray sweetlove –
Niall Donaghy –
Early days on this one, using it to support BPC-157 and TB-500 for tendon recovery. Not sure of the effects but can say that this stack is already working after a few days. Curious to see if sleep improves or gym progress improves.
Jamie B. –
2nd cycle going extremely well!
Anonymous –
barrie swaine –
One of the tb 500 and a bottle of lpamorelin was cloudy in its dry form and looked like some separation had occurred I’m currently on day 3 of no reply and the chat bot isn’t fit for purpose
Pearl –
Well packaged. Good high-quality product. Arrived very quickly.
Anonymous –
Anne Mclachlan –
Good product
james shanks –
GARRY BLACKSTONE –
Patrick Kirwan –
Karen Taylor –
Wonderful product.
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So convenient.
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Best purchase ever.
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Quick shipping and excellent service.
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Delivery was fast and the product is great.
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Delivery was faster than I expected.
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Arrived way earlier than I thought.
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Delivery was fast and the product is great.
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So pleased with this purchase.
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Very durable and reliable.
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This is amazing quality.
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Love the results.
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Fast delivery.
Ash –
Does the job perfectly.
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So useful.
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Very dependable product.
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CouldnÕt ask for more.
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Very durable and reliable.
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This is my go-to.
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Love the results.
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IÕm very pleased.
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CanÕt recommend enough.
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I use it all the time.
Clareece –
Excellent performance.
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Totally recommend it.
Lisa Kaye –
Does what itÕs supposed to.
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So glad I bought this.
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Best purchase ever.
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It works so well.
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This is an incredible buy.
Ami –
This is top-tier quality.
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Love this item.
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Super happy with how it works.
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IÕm really pleased with this.
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Simply amazing.
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ItÕs just fantastic.
Verified Buyer –
IÕm very pleased.
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Great craftsmanship.
Jacob –
High quality.
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Absolutely love this.
beth henson –
IÕm impressed.
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ItÕs a winner.
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Perfect for my needs.
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Fantastic product.
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Love the design.
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So useful.
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Highly recommend.
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Very happy with the performance.
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Fantastic performance.
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Absolutely fantastic.
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Just incredible.
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Absolutely love using it.
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Very dependable.
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Very happy with my choice.
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Thrilled with this purchase.
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CouldnÕt be happier.
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Fast delivery, product is perfect.
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Super fast delivery!
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Got it fast, highly satisfied.
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Came so fast, amazing service.
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Fast delivery, exceeded expectations.
Emma C. –
Absolutely love the quality.
Lucy G. –
Highly reliable.
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Awesome purchase.
Oliver Anthony –
Exactly as described.
Emma A. –
CouldnÕt be more pleased.
Ida M. –
A total game-changer.
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Super useful.
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Thrilled with this purchase.
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IÕm obsessed.
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Perfect for my needs.
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Best thing IÕve bought.
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IÕm loving it.
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Just love it.
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Absolutely perfect.
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Top-notch quality.
stephanie –
Worth every penny.
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Just love how it works.
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Very happy with the performance.
Arthur Caulfield –
Performs better than I thought.
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Very durable and reliable.
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Worth the price.
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Very dependable.
Charlotte –
Perfect for what I needed.
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Fast delivery.
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Love how it works.
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Very practical.
Jess H. –
Came fast, works perfectly.
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Lightning fast shipping, highly recommend.
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Fast shipping, great experience.
Rhoslyn –
Beyond impressed.
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Best value ever.
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CouldnÕt ask for more.
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Totally dependable.
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So pleased with this.
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Very dependable.
Sarah –
Very happy with my choice.
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CanÕt go wrong with this.
Amy A. –
IÕm very pleased.
Daniel –
One of my favorites.
Sarah Lowing –
Love using this.
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So pleased with this purchase.
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Very happy with the quality.
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Totally recommend this product.
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This is so well made.
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IÕm completely sold.
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Very high-quality.
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Does the trick.
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Very useful and practical.
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ItÕs perfect.
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Super convenient.
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Came fast, works perfectly.
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Fast delivery, exceeded expectations.
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Speedy delivery, works perfectly.
Clement –
Delivery was super quick.
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Got it fast, highly satisfied.
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Arrived fast, very pleased.
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Fast shipping, really impressed.
Eleanor –
Speedy delivery, couldnÕt be happier.
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Very fast delivery, love the product.
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Got here faster than anticipated.
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Super happy with my decision.
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ItÕs everything I wanted.
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Works better than expected.
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Absolutely fantastic.
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IÕm really pleased with this.
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A must-buy.
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Totally dependable.
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It works beautifully.
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Highly reliable.
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Awesome purchase.
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Awesome purchase.
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Extremely satisfied.
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Delivery was super fast and smooth.
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High-quality product.
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The best product IÕve ever used.
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So glad I found this.
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CouldnÕt be more pleased.
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Incredibly useful.
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Super efficient.
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This is my go-to.
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Truly excellent.
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Exactly as described.
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No complaints at all.
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Received it so fast, thank you!
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This is really great quality.
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Truly excellent.
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CanÕt go wrong with this.
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IÕm obsessed.
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I highly recommend this.
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Very quick delivery, no issues.
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Really fast delivery, highly recommend.
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Five stars.
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Absolutely love the quality.
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Love this item.
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It works beautifully.
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Extremely satisfied.
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Very quick delivery, no issues.
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Fast shipping, great experience.
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Delivery was incredibly fast!
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Very efficient.
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Thrilled with this purchase.
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IÕve bought better for cheaper.
Emma Payne –
Not worth the price tag.
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IÕve seen better for less.
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IÕve had faster deliveries from other places.
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I could have walked here faster.
Matthew C. –
Wasn’t impressed with the slow delivery.
Ann H. –
Not worth the wait, considering the shipping time.
Callum –
Very disappointed in the slow delivery.
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Could have been much better.
Eleanor R. –
Really low-quality product.
Rebecca S. –
Delivery speed was awful.
Evangeline –
Why did this take forever to arrive?
Abi Askey –
Took way too long to arrive.
Seema D. –
Really low-quality product.
Kirsty –
Feels like a waste of money.
Lou H. –
DoesnÕt work as advertised.
Karen Yvonne Hills –
Wasn’t impressed with the slow delivery.
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It felt like forever waiting for this.
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Why did this take forever to arrive?
Steven –
ItÕs definitely not worth the cost.
Anonymous –
The quality just isnÕt there.
Klaudia –
Very disappointed in the slow delivery.
Lewis Gowans –
Delivery was delayed, very frustrating.
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Amazing, ordering again!
Alex –
Anonymous –
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David C. –
Ashley –
Great item, arrived very quickly.
Anonymous –
Danny Toolan –
Shaun –
Bought this a few times
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Anonymous –
Very good and quick delivery
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great works fine
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Recieved quickly. Good quality
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Anonymous –
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Helping with sleep, great product, working brilliantly!
Charlie –
Great results and extremely happy 🙂
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Ellen S. –
Amazing, ordering again!
Alex –
Anonymous –
Bruce D. –
David C. –
Ashley –
Great item, arrived very quickly.
Anonymous –
Egidijus Eidukas –
They sent me different peptides than I had ordered. But luckily, I wanted to buy those other peptides in the future anyway. I’ve been using OP peptides for a long time, they work, and I’m satisfied.
Danny Toolan –
Connor T. –
Best there is!
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Great price and works amazingly
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Bought this a few times
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Good product very effective
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Anonymous –
Very good and quick delivery
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great works fine
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Recieved quickly. Good quality
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Evcellent servise and quality products
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Anonymous –
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Helping with sleep, great product, working brilliantly!
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Love the product it’s self small shipping delay but I can’t complain
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Love the product it’s self small shipping delay but I can’t complain
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Great product & fast delivery. Thanks
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Very good
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Chee Seong Foo –
Amjid s. –
George Bowe –
Craig –
Fast delivery good product
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Brilliant
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Awesome service
Matt Webb –
Anonymous –
Patrick Kirwan –
Anonymous –
John Russell –
Anonymous –
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Good stuff at good price
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Great price excellent service
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Very good
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Good price and genuine quality
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Glenn –
Don’t buy. I think they’re not real. Dodgy packaging. No contact number or email and the chat bot doesn’t respond.
Phil Booth –
Great stuff. I take alongside CJC. Great customer service when i had an address issue (i put wrong street). Love this stuff, its kept me lean but put on great size. And my sleep is so deep now for the first time ever. No need for sleeping tablets anymore!
Richard G. –
Really disappointed with the quality.
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IÕm obsessed.
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Very reliable.
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IÕm impressed.
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Beyond impressed.
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Excellent quality product.
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Absolutely fantastic.
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Best quality IÕve had.
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Works perfectly every time.
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Very high-end.
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Absolutely love using it.
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Truly excellent.
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Very dependable.
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Fast delivery.
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ItÕs awesome.
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Well made.
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So convenient.
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Great quality product.
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Feels like a knock-off version.
Emma M. –
Happy customer.
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Fast shipping and excellent quality.
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Got here fast, product is awesome.
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Fast delivery and works perfectly.
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Fast delivery, couldnÕt be happier.
Kelly Harvey –
Package arrived late, unacceptable.
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Product came fast, love the quality.
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Quick delivery, great value for money.
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Came fast, couldnÕt ask for more.
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Quick delivery, perfect condition.
Anna C. –
Shipping took way too long.
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Fast delivery, couldnÕt be happier.
Claire Hunt –
Not pleased with the shipping time.
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Quick shipping, great service.
Jackie O. –
Not worth waiting this long for the product.
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CouldnÕt be more satisfied.
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Great product, would buy again.
Emma –
Worth every penny..
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Just love it.
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Excellent value for money.
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Completely satisfied.
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Totally recommend it.
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Great quality product.
Jacqueline –
Does exactly what it says.
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ItÕs a lifesaver.
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Five stars.
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Arrived fast, amazing product.
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Quick delivery and love the product.
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Very fast delivery, love the product.
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Excellent product and fast delivery.
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Fast delivery, super pleased.
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Arrived so fast, very happy!
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Delivery was incredibly fast!
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IÕm really pleased with this.
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Really disappointed with the quality.
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Love the features.
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Love this item.
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A must-buy.
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WouldnÕt recommend because of the delivery time.
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Just incredible.
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Delivery was much slower than expected.
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Best in the market.
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I highly recommend this.
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Fast delivery, very satisfied with my purchase.
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Arrived quickly, exactly what I wanted.
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Fast delivery, works great for me.
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Arrived quickly, love the quality.
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Super fast shipping, very happy.
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Fast delivery, exceeded expectations.
Lorna –
Fast delivery, super pleased.
Anonymous –
Ridiculously slow delivery.
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Fast shipping, just as described.
Anonymous –
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Love using this.
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ItÕs perfect.
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Absolutely love the quality.
Marine –
Not worth the wait.
isabel –
Performs better than I thought.
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IÕm loving this product.
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Brilliant value.
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Works perfectly every time.
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Excellent choice.
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Unbelievably slow delivery.
Anonymous –
Very efficient.
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Very impressed with this.
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Excellent value for money.
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Jade F. –
Way too slow, wonÕt order again.
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IÕm obsessed.
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So glad I bought this.
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No regrets.
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Great addition to my collection.
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Very versatile.
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Shipping took way too long.
virginia evans –
Absolutely perfect.
Sarah Stanbrook –
Delivers as promised.
Jarrad Harries –
Not pleased with the shipping time.
Callum Rothero –
No complaints at all.
Chloe Womack –
Does exactly what it says.
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Totally satisfied.
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Just awesome.
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Exactly what I needed.
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Absolutely love the quality.
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Very happy with the performance.
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Delivery was delayed, very frustrating.
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IÕm blown away by the quality.
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IÕm thrilled with the results.
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Very practical product.
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It took forever to get here.
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Totally dependable.
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Very happy, arrived very fast. Thank you.
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Highly satisfied.
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The quality just isnÕt there.
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Exactly what I needed.
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Totally satisfied with this.
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IÕm amazed by how well this works.
Katie Hodges –
Feels like I wasted my money.
Emily –
Michelle Dunstan –
IÕm so impressed.
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Absolutely love using it.
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CanÕt go wrong with this.
Mark –
Got it so fast, very satisfied.
Anonymous –
Came faster than expected, very happy.
Chris H. –
Seriously, what took so long?
Nic –
Extremely satisfied.
Aiden –
DidnÕt last as long as it should.
Neil Marshall –
Performs wonderfully.
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So glad I bought it.
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Could have arrived faster.
Gill Prentis –
Exceeded expectations.
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Excellent craftsmanship.
Catherine T. –
Totally worth it.
Craig W. –
Highly recommend.