GLP-3RT [5MG] from Pinnacle Peptide Labs vs RETA GLP-3 from IRON Peptides | Exhaustive Comparison (Product, Dosage, Cost, Company)
This is a comparison between GLP-3RT [5MG] vs RETA GLP-3 — two different brand names for the same research peptide called retatrutide. One comes from Pinnacle Peptide Labs and the other from IRON Peptides. Think of it like two stores selling the same product under different labels.
The compound inside is the peptide (purity level may vary), but when you look closer at the quality documentation, pricing structure, available sizes, and company background, real differences start to show up.
That is exactly what we have broken down for you in this blog, so you can make a smarter, more informed decision before you buy.
If you are sourcing Retatrutide peptide for laboratory research, you have probably come across two suppliers: Pinnacle Peptide Labs with their GLP-3RT [5MG] and IRON Peptides with their RETA GLP-3.
So what is actually different between them? This exhaustive comparison of GLP-3RT [5MG] from Pinnacle Peptide Labs vs RETA GLP-3 from IRON Peptides.
It is side-by-side comparison covers that covers product specs, dosage options, pricing tiers, company positioning, and more, using only verified information from each supplier’s own listing.
KEY TAKEAWAYS of GLP-3RT [5MG] vs RETA GLP-3
- Same compound, same entry price– Both products contain retatrutide and both start at $89.99 for 5 mg. The competition is entirely on documentation, size options, and scale pricing.
- Pinnacle Peptide Labs wins on transparency– They are the only one of the two that publicly states ≥99% HPLC purity, independent third-party COA, lyophilized form, and U.S. origin. For labs with strict procurement documentation requirements, this matters a lot.
- IRON Peptides wins on scalability– Four size options (5 mg, 10 mg, 30 mg, 60 mg) vs. Pinnacle’s single 5 mg format is a big practical advantage for researchers running larger studies. You cannot get a 30 mg or 60 mg vial from Pinnacle at all.
- Bulk discounts favor different buyers– Pinnacle’s discounts go deeper (up to ~20% off at 21+ vials) but only apply to 5 mg vials. IRON Peptides’ discounts kick in faster (at just 3 units) but max out at 10% off.
- Stock availability favors IRON Peptides significantly– 138 units in stock vs. only 2 left at Pinnacle. For time-sensitive research procurement, this is a real operational risk difference.
- IRON Peptides has information gaps– Their listing does not publicly confirm purity %, COA availability, testing methodology, form (lyophilized or not), or country of production. These gaps do not mean the quality is lower, they just mean a researcher has to ask before ordering.
Before diving deeper into the comparison, let’s talk a little bit about the companies first.
Pinnacle Peptide Labs
When the integrity of your research depends on what’s inside the vial, the supplier you choose matters more than almost anything else. Pinnacle Peptide Labs is a family-owned, Miami-based research supply company founded by first responders, people who built their careers around precision, accountability, and getting it right the first time.
Pinnacle Peptide Labs manufactures all their peptides in a U.S.-based, cGMP-certified facility. Independent third-party testing then verifies their identity and confirms a $\ge 99\%$ purity level, ensuring you never have to just take a supplier’s word for it.
With over 10,000 orders shipped, free shipping on orders over $149, and next-business-day fulfillment backed by dedicated U.S.-based customer support, Pinnacle operates with the kind of reliability that serious laboratory work demands.
This is not a faceless overseas vendor moving volume, it is a team that prioritizes quality over quantity, transparency over convenience, and long-term professional relationships over one-time transactions. For researchers who cannot afford to question what is in their reference materials, Pinnacle Peptide Labs is the straightforward answer.
IRON Peptides
IRON Peptides provides researchers with top-tier, medical-grade peptides produced right in the American Midwest. With over 11 years of experience, they have built a reputation for excellence by handling the entire processfrom design to final testing in-house.
Here is why researchers trust them:
- Purity You Can Verify: They don’t just talk about quality; they prove it. Every batch comes with a Certificate of Analysis, confirming its purity through advanced lab testing like HPLC and Mass Spectrometry.
- Total Control: Because they manufacture everything in their own facility, they don’t rely on third-party suppliers or pre-made products. This vertical integration ensures that what you receive is exactly what you ordered.
- Vetted Sourcing: They are incredibly selective about their raw materials. Every component is sourced from trusted suppliers who meet their strict quality standards.
- Professional Integrity: They aren’t a compounding pharmacy; they are a dedicated peptide synthesis lab. Their sole focus is delivering high-quality, reliable materials for your research and development needs.
Researchers trust IRON Peptides because of the consistency and rigor they bring to their work.
Comparison Between Suppliers: Pinnacle Peptide Labs vs IRON Peptides
Companies like Pinnacle Peptide Labs and IRON Peptides are the sum of years of promising research, rigorous quality standards, operational experience, and a genuine commitment to serving the scientific community.
Behind each brand is a team of dedicated professionals working to ensure that researchers have access to dependable, high-purity reference materials that hold up under the demands of controlled laboratory environments.
With that in mind, we have done our best to compare both companies across multiple aspects, product quality, documentation transparency, size availability, pricing structure, fulfillment speed, and company background, so that the comparison stays as fair, balanced, and useful as possible.
| Feature | Pinnacle Peptide Labs | IRON Peptides |
|---|---|---|
| Company Type | Family-owned, U.S.-based | Established research supplier |
| Founded By | First responders | Experienced research supply team |
| Location | Miami, Florida | U.S.-based |
| Manufacturing | U.S. cGMP-certified facility | Research-grade production standards |
| Purity | ≥99% HPLC-verified, guaranteed | High-purity research grade |
| Third-Party Testing | Yes, independent laboratory testing | Quality-verified per batch |
| Certificate of Analysis (COA) | Yes, batch-specific | Available upon request |
| Product Form | Lyophilized powder | Research-grade peptide format |
| Available Sizes | 5 mg | 5 mg, 10 mg, 30 mg, 60 mg |
| Base Price (5 mg) | $89.99 | $89.99 |
| Bulk Discounts | Up to ~20% off (21+ vials) | Up to 10% off (10+ units) |
| Discount Starts At | 6 vials | 3 units |
| Free Shipping | Orders over $149 | Calculated at checkout |
| Order Fulfillment | Next business day | Prompt fulfillment |
| Customer Support | U.S.-based, dedicated support | Responsive support team |
| Total Orders Shipped | 10,000+ | Large-volume supplier |
| Stock Status (5 mg) | Low stock (2 left; backorder available) | High stock (138 available) |
| Intended Use | Laboratory and in-vitro research only | Laboratory research use only |
In the coming sections we will be discussing about GLP-3RT [5MG] vs RETA GLP-3 from different perspectives stay tuned!
What is GLP-3RT [5MG]?
GLP-3RT [5MG] is a 5-milligram vial of retatrutide, a synthetic triple-agonist peptide supplied by Pinnacle Peptide Labs for controlled laboratory and in-vitro research use.
It simultaneously targets three key metabolic hormone receptors: GLP-1 (glucagon-like peptide-1), GIP (glucose-dependent insulinotropic polypeptide), and the glucagon receptor, making it a uniquely complex research compound compared to single or dual agonist peptides.
Each vial is manufactured in a U.S.-based, cGMP-certified facility, verified to ≥99% purity through HPLC analysis, and supplied in lyophilized (freeze-dried) powder form for maximum stability and precise reconstitution in laboratory settings. A batch-specific Certificate of Analysis from an independent third-party lab is available for every order, giving research teams full documentation of compound identity and purity.
Featuring a molecular weight of 4,731.33 g/mol, a molecular formula of $C_{233}H_{344}F_3N_{60}O_{70}$, and CAS number 2381089-83-2, GLP-3RT serves as a chemically well-defined reference material. Researchers utilize this compound to investigate incretin-related signaling pathways, metabolic regulation, appetite control, energy expenditure, and adipose tissue modulation. We provide this product strictly for laboratory research purposes; regulatory authorities have not approved it for human or animal use.
What is RETA GLP-3?
RETA GLP-3 is a retatrutide-based synthetic peptide compound from IRON Peptides, designed for laboratory research investigations involving incretin-related signaling pathways and metabolic research models. What sets RETA GLP-3 apart from many single-format peptide suppliers is its availability across four quantity tiers — 5 mg, 10 mg, 30 mg, and 60 mg. This variety offers flexibility to research teams operating at different scales, from small exploratory studies to larger, multi-arm experimental protocols.
Like retatrutide in general, RETA GLP-3 functions as a triple-agonist peptide that targets the GLP-1, GIP, and glucagon receptors simultaneously. This unique mechanism attracts scientists studying metabolic homeostasis, glucose regulation, appetite suppression, energy expenditure, and lipid metabolism at the molecular level.
What sets RETA GLP-3 apart from many single-format peptide suppliers is its availability across four quantity tiers — 5 mg, 10 mg, 30 mg, and 60 mg making it a flexible option for research teams operating at different scales, from small exploratory studies to larger, multi-arm experimental protocols.
Like retatrutide in general, RETA GLP-3 functions as a triple-agonist peptide targeting the GLP-1, GIP, and glucagon receptors simultaneously, positioning it as a research compound of interest for scientists studying metabolic homeostasis, glucose regulation, appetite suppression, energy expenditure, and lipid metabolism at the molecular level.
As with all retatrutide-based research compounds, RETA GLP-3 is strictly intended for controlled laboratory and in-vitro research use only and is not approved for human or animal consumption under any circumstances.
Reviews : GLP-3RT [5MG] vs RETA GLP-3
The products GLP-3RT [5MG] and RETA GLP-3, specializes peptide formulations used in scientific research. The following section provides reviews and analysis of these specific formulations, focusing on their product consistency, analytical documentation, and performance within laboratory settings.
Reviewing GLP-3RT [5MG] from Pinnacle Peptide Labs
Clean. Documented. Trustworthy. That is the three-word verdict on Pinnacle’s GLP-3RT. The brand’s $\ge 99\%$ HPLC purity is not a marketing claim—an independent third-party COA verifies every single batch. The lyophilized format proves Pinnacle built this compound for real lab work, not shelf decoration. The company enforces strict standards through U.S. cGMP manufacturing, provides next-business-day shipping, and relies on a founding team of first responders who understand what accountability actually means. That is not a coincidence—that is a standard. If your research cannot afford a question mark over compound integrity, GLP-3RT removes it entirely.
Rating: 4.7 / 5
99% HPLC Purity Has Made Pinnacle Peptide Labs Unique in the Industry
With a 99% purity guarantee, next-business-day shipping, and free delivery on orders over $149, Pinnacle Peptide Labs sets itself apart with over 10,000 orders shipped.
Reviewing RETA GLP-3 – from IRON Peptides
Versatile. Stocked. Ready. IRON Peptides built RETA GLP-3 for researchers who think in scale, not just single vials. Four size formats — 5 mg all the way to 60 mg — means your procurement matches your protocol, not the other way around. 138 units in stock means no waiting, no backorders, no disrupted timelines. Bulk discounts that kick in at just 3 units show they understand how real labs actually buy. The public listing leaves some quality documentation details unspoken — purity confirmation and COA specifics are worth a direct conversation with the supplier — but the flexibility and availability alone make RETA GLP-3 a serious contender for high-volume research pipelines.
A Trustpilot Rating of 4.6/5 Positions Iron Peptides One Step Ahead of the Competition
While this product features a commendable Trustpilot Trust Score of 4.3/5, IRON Peptides distinguishes itself within the research peptide supply sector by securing an exemplary rating of 4.6/5.
Product Comparison: What You Get in the Vials of GLP-3RT [5MG] and RETA GLP-3
GLP-3RT [5MG] – Pinnacle Peptide Labs
Pinnacle Peptide Labs markets GLP-3RT as a high-purity reference compound aimed squarely at controlled laboratory settings. Here is what the listing confirms:
- Purity: ≥99%, verified by HPLC (high-performance liquid chromatography)
- Form: Lyophilized (freeze-dried) peptide powder
- Quantity: 5 mg per vial
- Testing: Independent third-party Certificate of Analysis (COA) on each batch
- Origin: U.S. produced and fulfilled
- Storage: Cool, dry environment
The lyophilized format is important for research use. Freeze-drying stabilizes peptides during shipping and long-term storage, allowing researchers to reconstitute them precisely when needed;a critical factor for ensuring reproducibility in laboratory experiments.
An independent third-party COA on each batch provides a significant quality signal. This certification ensures that an outside analytical lab has verified the purity level, rather than the supplier simply self-reporting the claim.
RETA GLP-3 – IRON Peptides
IRON Peptides positions RETA GLP-3 as a product available at multiple quantity tiers, which is the strongest differentiator of this listing. Available sizes include:
- 5 mg
- 10 mg
- 30 mg
- 60 mg
The base 5 mg price matches Pinnacle Peptide Labs at $89.99. The listing does not publicly specify purity percentage, testing methodology, COA availability, form (lyophilized vs. liquid), or country of production on the product page as provided.
For research teams that need larger quantities in a single order – for example, running extended assay series or multi-arm studies – the 60 mg option is a meaningful advantage that Pinnacle Peptide Labs simply does not offer.
Dosage Options: GLP-3RT [5MG] vs RETA GLP-3
This is where the two suppliers diverge most clearly.
Pinnacle Peptide Labs offers only one size: 5 mg. If your research protocol requires more material, you would need to order multiple vials.
IRON Peptides offers four sizes: 5 mg, 10 mg, 30 mg, and 60 mg. This gives research teams far more flexibility to match their order to the exact scale of their study — reducing both unit cost and the logistical overhead of handling many individual vials.
For a researcher running a large metabolic signaling study or a multi-week in-vitro experiment, ordering a single 30 mg or 60 mg vial is more practical and often more cost-efficient than juggling six or more 5 mg vials from another supplier.
Price Comparison Between GLP-3RT and RETA GLP-3
When comparing the pricing structures of Pinnacle Peptide Labs and IRON Peptides for GLP-3RT and RETA GLP-3, both offer a similar baseline entry point, but their volume-discount strategies cater to different research needs:
- Baseline Entry: Both products open at the same price point of $89.99 for a 5 mg vial.
- Pinnacle Peptide Labs (Bulk Reward): This provider is optimized for high-volume, small-vial buyers. Their pricing scales aggressively with quantity, offering deeper bulk discounts that drop the cost to $71.99 per vial once you reach a threshold of 21+ units—a savings of approximately 20%.
- IRON Peptides (Early-Access Discounts): This provider offers a more accessible discount tier, with price reductions beginning at just 3 units. While these discounts are more immediate, they cap out at a 10% reduction, making them less aggressive than Pinnacle’s high-volume rates.
- Value Through Scaling: IRON Peptides creates a competitive advantage through its broader range of vial sizes. By offering higher concentrations—such as 10 mg, 30 mg, and 60 mg vials,researchers can significantly lower their overall cost-per-milligram compared to buying multiple 5 mg units.
Pinnacle Peptide Labs — Bulk Pricing (Per Vial, 5MG Each)
| Quantity | Price Per Vial (5 mg Each) |
|---|---|
| 1–5 vials | $89.99 |
| 6–10 vials | $85.49 |
| 11–15 vials | $80.99 |
| 16–20 vials | $76.49 |
| 21+ vials | $71.99 |
Maximum savings: ~20% off at 21+ vials ($71.99 per 5 mg). These discounts apply to vials only, not milligrams — so you are always working in 5 mg increments.
IRON Peptides – Bulk Pricing (Per Unit, Across All Sizes)
| Quantity | Discount | Price Per Unit (from $89.99 base) |
|---|---|---|
| 1–2 units | None | $89.99 |
| 3–4 units | 3% off | $87.29 |
| 5–9 units | 5% off | $85.49 |
| 10+ units | 10% off | $80.99 |
IRON Peptides’ discounts kick in sooner (at just 3 units), but the maximum discount is lower (10% vs. Pinnacle’s ~20%). However, because IRON Peptides sells larger vials, “10+ units” of 30 mg or 60 mg vials represents a much larger total quantity of peptide.
Cost Per Milligram Analysis (at Base Price) of GLP-3RT [5MG] and RETA GLP-3 (Retatrutide from Pinnacle Peptide Labs and IRON Peptides
IRON Peptides does not publicly list 10 mg, 30 mg, and 60 mg prices in the provided data, so per-mg costs for larger sizes cannot be confirmed here. Researchers should check directly on the IRON Peptides website for current pricing on larger formats.
| Product | Vial Size | Price | Cost Per mg |
|---|---|---|---|
| GLP-3RT (Pinnacle) | 5 mg | $89.99 | $18.00/mg |
| RETA GLP-3 (IRON) | 5 mg | $89.99 | $18.00/mg |
| RETA GLP-3 (IRON) | 10 mg | Contact supplier | Estimated lower than $18.00/mg |
| RETA GLP-3 (IRON) | 30 mg | Contact supplier | Estimated lower than $18.00/mg |
| RETA GLP-3 (IRON) | 60 mg | Contact supplier | Estimated lower than $18.00/mg |
The point is simple, at 5 mg, both suppliers cost exactly the same per milligram. But as IRON Peptides’ vial size goes up, the cost per milligram almost certainly drops. We just cannot confirm the exact numbers without their larger-format pricing being publicly listed. If you are buying in bulk, contact IRON Peptides directly for a per-mg breakdown on the 30 mg and 60 mg options, that is where the real savings likely live.
Choose Pinnacle Peptide Labs if your research requires large quantities of standard 5 mg vials to secure the maximum discount. Option for IRON Peptides if you prioritize buying in larger, more efficient vial sizes, which typically offers superior long-term value for extensive laboratory studies.
Quality and Documentation: What to Look For in Research Peptides
When procuring any peptide for laboratory research, especially investigational compounds like retatrutide; quality verification matters. Here are the key checkpoints:
- Purity Percentage: ≥99% HPLC purity is the industry standard for research-grade peptides. Pinnacle Peptide Labs explicitly states this. IRON Peptides does not specify in the available listing data.
- Certificate of Analysis (COA): A batch-specific COA from an independent third-party lab confirms that what is in the vial matches what is on the label. Pinnacle Peptide Labs confirms COA availability. IRON Peptides does not mention this in the provided data.
- Form (Lyophilized vs. Liquid): Lyophilized peptides are more stable, easier to ship without degradation, and allow precise reconstitution. Pinnacle Peptide Labs confirms lyophilized format. IRON Peptides’ form is not specified in the provided data.
- Origin: U.S.-produced peptides are subject to domestic regulatory oversight. Pinnacle Peptide Labs is explicitly U.S.-produced. IRON Peptides does not specify.
These factors are worth clarifying directly with any supplier before making a purchasing decision for serious laboratory work.
Availability and Stock Comparison
| Feature | Pinnacle Peptide Labs | IRON Peptides |
|---|---|---|
| Current Stock | Only 2 units remaining (backorder available) | 138 units in stock |
| Lead Time Risk | Moderate — may require backorder fulfillment | Low — substantial inventory currently available |
| Size Availability | 5 mg only | 5 mg, 10 mg, 30 mg, and 60 mg options |
IRON Peptides has a significant availability advantage. With 138 units in stock across multiple sizes and no mention of backorder risk, labs that need reliable, quick fulfillment will find IRON Peptides a lower-risk choice from a supply chain standpoint.
Pinnacle Peptide Labs’ limited stock may be a temporary situation, but researchers working on time-sensitive protocols should factor this in.
Intended Use and Compliance Notice
Both suppliers are clear: these products are for laboratory research only.
Retatrutide is an investigational compound currently in Phase 3 clinical trials. It is not approved by the FDA or any regulatory authority for human or animal medical use. Neither GLP-3RT nor RETA GLP-3 should be used for:
- Human consumption or self-administration
- Animal veterinary treatment
- Medical diagnosis or therapy
- Any use outside a controlled research setting
Researchers are responsible for compliance with all applicable institutional, local, and national regulations governing the use of investigational peptides.
Who Should Choose Which Product?
Choose GLP-3RT from Pinnacle Peptide Labs if:
- Your lab requires a fully documented supply chain (batch-specific COA, independent third-party testing)
- You need a confirmed lyophilized format for long-term storage
- U.S.-origin verification matters for your procurement policy
- Your study requires only 5 mg quantities per order cycle
- You value premium-grade documentation over cost optimization
Choose RETA GLP-3 from IRON Peptides if:
- You need larger quantities in a single vial (10 mg, 30 mg, or 60 mg)
- You want bulk discounts that start at just 3 units
- Immediate availability and high stock levels are important
- Your study runs at a scale where 5 mg vials are not practical
- You are comfortable confirming quality specs directly with the supplier
Final Verdict
At $89.99 for 5 mg, both GLP-3RT and RETA GLP-3 are priced identically at the entry level. The right choice depends almost entirely on what your research operation needs.
For documentation-first labs — those that require traceable COAs, confirmed purity percentages, third-party testing, and U.S.-origin verification — Pinnacle Peptide Labs checks more boxes based on what is publicly stated in their listing.
For scale-first labs — those that need large quantities, multiple size options, reliable stock, and early bulk discounts — IRON Peptides is the stronger option, with the caveat that quality documentation details should be confirmed directly.
Neither product is appropriate for human or animal use. Both are supplied for in-vitro and preclinical research investigation only, consistent with retatrutide’s current status as an investigational compound.
Frequently Asked Questions about RETA GLP-3 and GLP-3RT
What does GLP-3 Retatrutide do?
Retatrutide (often referred to as “reta” or a GLP-3 agonist) is a novel, investigational weight-loss and diabetes medication. Unlike older GLP-1 drugs that target one or two receptors, it uniquely activates three hormone receptors: GLP-1, GIP, and Glucagon.
Is retatrutide the same as semaglutide or tirzepatide?
No. Retatrutide (GLP-3RT / RETA GLP-3) is a triple agonist targeting GLP-1, GIP, and glucagon receptors simultaneously. Semaglutide targets only GLP-1, and tirzepatide targets GLP-1 and GIP. Retatrutide’s additional glucagon receptor activity is what differentiates it and is associated with greater energy expenditure effects in research models.
Can I use these peptides for personal use?
No. These products are explicitly labeled for laboratory research use only. Retatrutide is not FDA-approved for human medical use. It must only be accessed through legitimate clinical trials.
What does lyophilized mean?
Lyophilized means freeze-dried. Peptides in lyophilized form have removed moisture content, making them more stable during shipping and long-term storage. They are reconstituted with a sterile solvent before use in research protocols.
What is an HPLC COA?
HPLC stands for high-performance liquid chromatography. A COA (Certificate of Analysis) based on HPLC testing measures the purity of the peptide by separating its components and quantifying them. A ≥99% HPLC purity result means at least 99% of the material is the target compound with minimal impurities.
What is the CAS number for retatrutide?
The CAS number for retatrutide is 2381089-83-2. It is also known as LY-3437943 and NOP2Y096GV.
Is GLP-3 used for weight loss?
In a phase 3 clinical trial, the medication retatrutide helped control blood sugar levels in participants with type 2 diabetes and led to an average of up to 36.6 pounds of weight loss, according to drugmaker Eli Lilly. Retatrutide is among an emerging generation of weight loss drugs called GLP-3 agonists.
How Much Does Retatrutide Cost for Research?
For laboratory research purposes, retatrutide starts at $89.99 for a 5 mg vial — the entry price is identical whether you order from Pinnacle Peptide Labs (GLP-3RT) or IRON Peptides (RETA GLP-3). That works out to roughly $18.00 per milligram at base price.
Where the cost starts to shift is volume and vial size — Pinnacle’s bulk pricing can bring a 5 mg vial down to $71.99 at 21+ units, while IRON Peptides’ larger 30 mg and 60 mg formats likely push the per-milligram cost meaningfully lower, though exact pricing on those sizes needs to be confirmed directly with the supplier.
Budget $90 to get started, and explore bulk options if your research protocol demands consistent, long-term supply.
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