This blend combines two complementary growth hormone secretagogues in one vial. Tesamorelin is a stabilized analogue of growth hormone-releasing hormone, GHRH(1-44), that signals the pituitary through the GHRH receptor. Ipamorelin is a selective pentapeptide that acts on a separate receptor, GHS-R1a, the same target as endogenous ghrelin.
Because the two compounds engage different receptors, laboratories that buy tesamorelin ipamorelin blend vials often run both pathways together rather than separately. Researchers who buy tesamorelin ipamorelin blend material in a pre-combined vial avoid the reconstitution variance that comes with measuring and mixing two independent peptides. For background on the secretagogue class, see our CJC-1295 and ipamorelin growth hormone guide.
Detailed Mechanism of Action
Growth hormone secretion from the anterior pituitary is governed by two opposing hypothalamic signals. GHRH drives release from somatotroph cells, while somatostatin suppresses it. Tesamorelin occupies the GHRH receptor side of that system. It is a synthetic GHRH(1-44) analogue carrying a trans-3-hexenoyl group at the N-terminus, a modification that extends half-life relative to native GHRH by slowing enzymatic degradation.
Ipamorelin works through an entirely separate channel. It is a pentapeptide with the sequence Aib-His-D-2-Nal-D-Phe-Lys-NH2 that binds the growth hormone secretagogue receptor subtype 1a. GHS-R1a is a G-protein-coupled receptor expressed on somatotrophs and in the hypothalamus, and it is the receptor through which ghrelin exerts its own GH-releasing effect.
The combination is studied because GHRH-receptor and GHS-R1a signaling are additive rather than redundant. Activating the GHRH receptor increases the amplitude of a GH pulse; activating GHS-R1a both amplifies release and attenuates somatostatin tone. Laboratories that buy tesamorelin ipamorelin blend vials are typically modeling that two-input condition rather than either pathway on its own.
Ipamorelin’s defining characteristic in the literature is selectivity. Earlier growth hormone releasing peptides such as GHRP-2 and GHRP-6 raise GH but also produce dose-dependent increases in ACTH, cortisol, and prolactin. Ipamorelin does not, which is why it is frequently chosen as the secretagogue component when a protocol must avoid confounding stress-hormone variables. Both peptides retain the pituitary feedback loop, so IGF-1 continues to exert inhibitory control, unlike exogenous recombinant GH administration.
Published Research
Tesamorelin carries the larger clinical dataset of the two. Falutz and colleagues reported in the New England Journal of Medicine in 2007 on a multicenter randomized trial of 412 participants receiving 2mg daily subcutaneously or placebo for 26 weeks. Visceral adipose tissue fell by 15.2% in the treatment arm while rising 5.0% under placebo, triglycerides dropped by 50 mg/dL against a 9 mg/dL increase, and IGF-1 rose 81.0% versus a 5.0% decline. Glycemic measures showed no significant difference between groups. The full abstract is available on PubMed (Falutz et al., 2007).
Stanley and colleagues extended that work in JAMA in 2014, randomizing 50 participants to tesamorelin 2mg or placebo for six months and measuring ectopic fat directly. Visceral adipose tissue changed by -34 cm² against +8 cm² for placebo, a treatment effect of -42 cm², and hepatic lipid-to-water percentage fell by a median 2.0% versus a 0.9% rise. Fasting glucose rose transiently at two weeks but the difference was not significant at six months. See PubMed (Stanley et al., 2014).
Ipamorelin’s foundational characterization came from Raun and colleagues at Novo Nordisk, published in the European Journal of Endocrinology in 1998 under the title describing it as the first selective growth hormone secretagogue. The group demonstrated GH-releasing potency comparable to GHRP-6 while showing no significant elevation in ACTH, cortisol, or prolactin even at doses far above the GH-release ED50, and confirmed through antagonist profiling that the effect runs through a GHRP-like receptor rather than the GHRH receptor. The record is on PubMed (Raun et al., 1998). Note that the published combination literature pairs ipamorelin most often with CJC-1295; tesamorelin pairings are less represented in peer-reviewed work, which is part of what makes this blend a subject of ongoing investigation.
Tesamorelin + Ipamorelin Blend vs Alternatives
| Feature | Tesamorelin + Ipamorelin | Tesamorelin alone | CJC-1295 + Ipamorelin |
|---|
| Receptors engaged | GHRH-R and GHS-R1a | GHRH-R only | GHRH-R and GHS-R1a |
| GHRH component | Tesamorelin, GHRH(1-44) analogue | Tesamorelin | CJC-1295, GHRH(1-29) analogue |
| Human clinical data on GHRH arm | Extensive | Extensive | Limited |
| Visceral fat endpoint data | Yes, via tesamorelin arm | Yes | Minimal |
| Cortisol and prolactin impact | Not observed in ipamorelin studies | Not applicable | Not observed |
| Vials to reconstitute | One | One | One or two depending on format |
| Ratio control | Fixed 6:4 as supplied | Single compound | Variable if dosed separately |
| COA scope | Both peptides assayed | Single assay | Varies by supplier |
Why Researchers Buy Tesamorelin Ipamorelin Blend Vials Pre-Combined
The case to buy tesamorelin ipamorelin blend material pre-combined comes down to error control. Mixing two peptides at the bench introduces two sources of error: measurement variance at each transfer, and differential loss during handling. A pre-combined lyophilized vial eliminates both, because the 6:4 ratio is fixed at the point of manufacture and verified in a single assay.
The trade-off is ratio flexibility. A protocol that needs to vary the GHRH-to-secretagogue proportion across arms will want separate vials. Laboratories that buy tesamorelin ipamorelin blend material are generally holding that ratio constant and varying something else, such as timing, vehicle, or total exposure. Our peptide stacking guide covers how combination decisions are typically structured.
Research Protocol Design Considerations
The practical question for any laboratory group is whether a fixed-ratio vial fits the experimental design. Most groups that buy tesamorelin ipamorelin blend material are running a dual-pathway arm against a single-pathway control, which means the ratio only has to be consistent, not adjustable.
Timing is the variable most often manipulated by groups that buy tesamorelin ipamorelin blend vials. Because GH secretion is pulsatile and strongly circadian, the hour at which a model is dosed changes the measured amplitude considerably. Groups commonly standardize on a fixed point relative to the dark cycle so that results compare across runs.
Washout is the second consideration. Both compounds work upstream of the pituitary rather than replacing growth hormone directly, so the feedback loop remains intact and recovery between arms is generally faster than with exogenous GH designs. Our guide to cycling considerations and the peptide half-life chart are useful when mapping out an exposure schedule.
Finally, document the lot. Researchers who buy tesamorelin ipamorelin blend vials across several months should record the lot number against each run, because comparing data from different batches without that record removes a variable you may later need. Every PSPeptides shipment makes this straightforward by including the COA for the exact lot supplied.
Reconstitution & Handling
After you buy tesamorelin ipamorelin blend vials, reconstitute with bacteriostatic water added slowly down the inner wall of the vial. Do not inject the diluent directly onto the lyophilized cake and do not shake. Swirl gently until the powder has fully dissolved, which usually takes under a minute.
At 2mL of bacteriostatic water, a 10mg vial yields 5mg/mL of combined peptide, which works out to 3mg/mL tesamorelin and 2mg/mL ipamorelin. At 3mL the solution is approximately 2mg/mL tesamorelin and 1.33mg/mL ipamorelin. Because this is a fixed-ratio blend, every volume drawn carries both compounds in the same 6:4 proportion. Our reconstitution walkthrough and dosage calculator guide cover the arithmetic in detail, and what bacteriostatic water is explains why the benzyl alcohol preservative matters for multi-draw vials.
Storage & Stability
Laboratories that buy tesamorelin ipamorelin blend vials should store them sealed at -20°C for long-term holding. Short transit at ambient temperature is tolerated, which is why the product ships without cold chain, but the vial should go into the freezer on arrival.
Once reconstituted, keep the vial refrigerated at 2-8°C and shielded from light. Reconstituted peptide solutions are generally handled within two to four weeks. Avoid repeated freeze-thaw cycles on solution, which degrade peptide integrity faster than steady refrigeration. See the peptide storage guide and the guide to spotting degradation for visual and handling checks.
Certificate of Analysis
Every lot ships with a batch-specific COA, so you know exactly what is in the vial when you buy tesamorelin ipamorelin blend material from PSPeptides. The document reports HPLC purity for the blend, mass spectrometry confirmation of molecular weight for each peptide, and identity data tying the result to the lot number printed on your vial.
When you buy tesamorelin ipamorelin blend material, check that the lot on the COA matches the lot on the vial you received. If you are unfamiliar with reading chromatograms, our guide on how to read a peptide COA explains peak area, retention time, and what a 99%+ figure actually describes.
Quality Control Before Each Blend Vial Ships
Before anyone can buy tesamorelin ipamorelin blend vials from a new lot, the material is synthesized under cGMP-compliant conditions in the United States rather than repackaged from bulk imports. Each batch is sampled and sent to an independent laboratory, not tested only in house, which is the distinction that matters when a supplier states a purity figure.
The independent assay runs reverse-phase HPLC to establish purity by peak area and mass spectrometry to confirm the molecular weight of both peptides in the blend. A batch that does not clear 99% is not released. This is the standard applied to every lot sold, so anyone who chooses to buy tesamorelin ipamorelin blend vials from PSPeptides receives material that has cleared the same gate.
Lyophilization and sealing happen under controlled conditions, and vials are inspected before packing. If a vial arrives damaged or the cake looks wrong, contact support before reconstituting; our guide to identifying degraded peptide explains what a healthy lyophilized cake should look like.
How to Buy Tesamorelin Ipamorelin Blend from PSPeptides
To buy tesamorelin ipamorelin blend vials, select the 10mg option above and add it to your cart. Orders placed before 2 PM EST ship the same business day, and orders over $150 ship free via UPS 2nd Day Air. Checkout supports credit cards, Afterpay, Klarna, Apple Pay, and Google Pay.
Researchers who buy tesamorelin ipamorelin blend vials alongside bacteriostatic water and syringes in one order consolidate shipping and receive everything needed to reconstitute on arrival. If you are deciding between this blend and a single-compound vial, our complete guide to peptides and supplier selection guide are useful starting points.
Ordering, Shipping and Support
When you buy tesamorelin ipamorelin blend vials before 2 PM EST on a business day, the order ships the same day. Orders over $150 ship free by UPS 2nd Day Air, and this blend is priced so that a single vial plus supplies typically clears that threshold.
Payment options include major credit cards, Afterpay, Klarna, Apple Pay and Google Pay, so laboratories splitting costs across a budget cycle have flexibility at checkout. Support runs seven days a week by email, phone or text, and questions about lot documentation are answered by the same team that handles order issues.
If you are comparing suppliers before you buy tesamorelin ipamorelin blend material, the things worth checking are consistent: independent third-party testing rather than in-house claims, a COA tied to your specific lot, domestic synthesis, and a support channel that answers. Our supplier evaluation guide walks through each.
Why Researchers Choose PSPeptides
- US Manufactured: cGMP-compliant synthesis, not repackaged overseas material
- Third-Party Tested: Independent HPLC and mass spectrometry on every batch
- Fast Shipping: Free UPS 2nd Day Air over $150, same-day dispatch before 2 PM EST
- Flexible Payments: Credit cards, Afterpay, Klarna, Apple Pay, Google Pay
- 7-Day Support: Email, phone, or text
What Ships With Every Order
Each order includes the sealed 10mg vial, the batch-specific certificate of analysis for your lot, and tamper-evident packaging. Bacteriostatic water and syringes are sold separately and are worth adding to the same order, since nothing in the vial can be used until it is reconstituted.
Customers who buy tesamorelin ipamorelin blend vials for the first time often add bacteriostatic water, insulin syringes and alcohol swabs together, which keeps shipping consolidated and gets the full setup to the bench in one delivery. Everything needed to buy tesamorelin ipamorelin blend material and begin work on arrival is available in the same catalog.
Related Research Peptides at PSPeptides
Groups that buy tesamorelin ipamorelin blend vials for growth hormone axis work frequently run them alongside other compounds in the same category. Tesamorelin and ipamorelin are stocked individually for protocols that need independent ratio control, and CJC-1295 with ipamorelin remains the most widely published GHRH-plus-secretagogue pairing.
For oral secretagogue work, our MK-677 research guide covers a non-injectable alternative that acts on the same GHS-R1a receptor. Laboratories studying recovery endpoints often pair GH-axis work with joint and tendon repair peptides.
Researchers who buy tesamorelin ipamorelin blend vials alongside these compounds consolidate testing documentation under one supplier, which simplifies record-keeping across a multi-arm study. Every product in the catalog ships with the same third-party assay standard and the same lot-specific COA, so there is no mixed-provenance gap when you buy tesamorelin ipamorelin blend material and related peptides together.
Frequently Asked Questions
Where can I buy tesamorelin ipamorelin blend for research?
You can buy tesamorelin ipamorelin blend vials directly from PSPeptides as a 10mg vial with a batch-specific COA in every shipment. The material is synthesized in a cGMP-compliant US facility and assayed by an independent laboratory before release.
What is in each vial?
Each vial contains 10mg of lyophilized powder: 6mg tesamorelin and 4mg ipamorelin. The ratio is fixed at manufacture, so every volume drawn after reconstitution carries both peptides in the same 6:4 proportion.
How does this differ from CJC-1295 with ipamorelin?
Both pair a GHRH-receptor agonist with a selective secretagogue. The difference is the GHRH component: tesamorelin is a GHRH(1-44) analogue with a substantial human clinical record, while CJC-1295 is a GHRH(1-29) analogue. Researchers who buy tesamorelin ipamorelin blend vials are usually choosing the better-documented GHRH arm.
Why combine a GHRH analogue with a ghrelin-receptor agonist at all?
The two act on separate receptors with complementary effects on the same cell population. GHRH-receptor activation raises pulse amplitude, while GHS-R1a activation both amplifies release and reduces somatostatin inhibition, so the inputs are additive rather than duplicative.
Does ipamorelin raise cortisol or prolactin?
The 1998 characterization by Raun and colleagues found no significant elevation in ACTH, cortisol, or prolactin even at doses well above those needed for GH release. That selectivity is the main reason ipamorelin is preferred over earlier GHRPs in protocols where stress hormones are a confounder.
Is a COA included when I buy tesamorelin ipamorelin blend from PSPeptides?
Yes. Every order placed to buy tesamorelin ipamorelin blend material ships with the certificate of analysis for the specific lot you receive, covering HPLC purity and mass spectrometry identity confirmation for both peptides in the blend.
How should the blend be reconstituted and stored?
After you buy tesamorelin ipamorelin blend material, add bacteriostatic water slowly down the vial wall, swirl rather than shake, and refrigerate at 2-8°C once in solution. Sealed vials belong at -20°C until use, and reconstituted solution should be kept out of direct light.
Is this product legal to buy for laboratory use?
This material is sold exclusively for laboratory and research use and is not intended for human consumption. Researchers who buy tesamorelin ipamorelin blend vials are responsible for compliance with the rules governing their own institution and jurisdiction. See our overview of research peptide legal status in 2026.
How fast does an order ship?
If you buy tesamorelin ipamorelin blend vials before 2 PM EST on a business day, same-day dispatch applies, with free UPS 2nd Day Air on orders over $150. You will receive tracking as soon as the label is generated.
What does 99%+ purity actually mean on the COA?
It refers to peak area on the HPLC chromatogram, meaning that over 99% of the detected peptide material is the target compounds rather than synthesis byproducts or truncated sequences. Mass spectrometry separately confirms identity by molecular weight.
Related Resources
All PSPeptides products are sold exclusively for laboratory and research use. Not intended for human consumption.
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