Why Evo Peptides Is the Best Place to Buy GLP-3 RT for Research
Six standards. All six met. Every batch.
Lot-specific purity
99.27% · 99.85% · 99.91%. Measured values. Not a "≥95%" floor.
Mass-spec identity
Intact mass confirmed, lipid included. Catches wrong or de-lipidated sequences.
Named independent lab
ILS Laboratories. Separate entity. Not an in-house QC sheet.
Secure card checkout
Credit and debit cards. Card-network dispute protection. Never P2P-only.
Wisconsin fulfillment
Same day before 3:00 PM CST. Saturday before 9:00 AM Central.
Strict RUO
Verified 21+ accounts. RUO acknowledgment at checkout. No human-use claims.
GLP-3 RT Lot-Specific Purity and Price by Vial
Table 2 — Evo Peptides GLP-3 RT (September 2026)
| Vial | HPLC Purity | Identity | Price | Cost / mg | Best For |
|---|---|---|---|---|---|
| 15mg | 99.27% | MS confirmed | $69.95 | $4.66 | Pilots, supplier validation |
| 20mg | 99.85% | MS confirmed | $89.95 | $4.50 | Mid-length studies |
| 30mg | 99.91% | MS confirmed | $134.95 | $4.50 | Longer studies, single-lot runs |
| 30mg (2 × 15mg) | Per lot COA | MS confirmed | $134.95 | $4.50 | 2-vial pack for split arms |
- Full COAs: evopeptidesus.com/coas.
- Reviewable before purchase. No request needed.
- Order multiples at once. Same batch. Same lot.
Why a 95% Purity Floor Fails GLP-3 RT Research
🧪 95% vs 99.9%: what the gap contains
- 95% = up to 5% uncharacterized material.
- Likely impurities: truncated sequences, de-lipidated species.
- De-lipidated material = altered pharmacokinetics in models.
- Result: shifted dose-response curves.
- Result: higher inter-experiment variability.
- Most exposed: glucagon-receptor endpoints.
- 99.91% = impurity load cut roughly 50×.
High-fidelity experimental reproduction starts at lot-specific ≥99%.
Peer-to-Peer-Only Payment: The Vendor Red Flag
- Venmo, Cash App, or Zelle as the only option.
- Usually means lost or denied card processing.
- No chargeback. No dispute rights. No recourse.
- Money moves before any accountability exists.
💳 How Evo handles it
- Conventional domestic credit/debit card checkout.
- Card-network buyer protection intact.
- App payments optional. Never required.
- Verified researcher account on every order.
Research Supply · Evo Peptides
GLP-3 RT 15mg · 20mg · 30mg
99.27–99.91% HPLC · MS identity · Card checkout · Ships before 3:00 PM CST
Shop GLP-3 RT
GLP-3 RT Compound Profile
Table 3 — GLP-3 RT (LY3437943) Reference Data
| Attribute | Detail |
|---|---|
| Catalog name | GLP-3 RT (also GLP3, GLP3-RT, RT3) |
| Development code | LY3437943 (retatrutide) |
| Class | Triple incretin agonist: GLP-1R / GIPR / GCGR |
| Length | 39 amino acids |
| Modification | C20 fatty diacid via linker (albumin binding) |
| Molecular weight | ~4,731 Da |
| Reference standard | None — MS identity required |
| Regulatory | Investigational Not FDA-approved. Not scheduled. |
| Supplied as | Lyophilized powder · Research Use Only |
Mechanism and trial background: GLP-3 RT research guide.
6-Point GLP-3 RT COA Checklist
All six. Or no purchase.
- HPLC purity ≥99%Chromatogram attached. Lot-specific value, not a floor.
- Mass spec identityESI-MS or MALDI-TOF. Intact mass near 4,731 Da, lipid included.
- Named third-party labSeparate legal entity. Verifiable contact details.
- Lot number matchCOA lot = vial label. Generic COAs prove nothing.
- Recent test dateWithin ~12 months. Tied to current stock.
- Public before purchasePosted on the product or COA page. No "request after order."
Figure 1 — What to Check on a GLP-3 RT COA (Illustrative Example)
Illustrative layout only. Actual batch reports for every Evo Peptides lot are on the COA page. Full walkthrough: How to Read a Peptide COA.
7 Red Flags When Buying GLP-3 Online
Table 4 — Red Flags vs What Good Looks Like
| Red Flag | Why It Matters | What Good Looks Like |
|---|---|---|
| P2P-only payment | No buyer protection. Often lost card processing. | Card checkout, dispute rights intact |
| "≥95% purity" floor | Marketing, not measurement | Lot-specific ≥99% values |
| No mass spec | Purity without identity | MS confirming ~4,731 Da |
| "COA on request" | No pre-purchase verification | COAs public before checkout |
| Unnamed or in-house lab | Conflict of interest | Named independent lab |
| No US operation | No entity, no address, no recourse | Registered US business, domestic fulfillment |
| Dosing or "results" talk | Outside the RUO framework | Strict in vitro research labeling |
Related Incretin-Class Research Compounds
Table 5 — Incretin & Amylin-Class Reference
| Compound | Class | Receptors | Evo Format | Price |
|---|---|---|---|---|
| GLP-3 RT | Triple agonist | GLP-1 · GIP · GCG | 15 / 20 / 30mg | From $69.95 |
| GLP-3 RT 30mg (2 × 15mg) | Triple agonist | GLP-1 · GIP · GCG | 2-vial pack | $134.95 |
| GLP-2 TRZ | Dual agonist | GLP-1 · GIP | 15 / 30mg | From $49.95 |
| GLP-2 TRZ 30mg (2 × 15mg) | Dual agonist | GLP-1 · GIP | 2-vial pack | $74.95 |
| GLP-1 SM | Single agonist | GLP-1 | Not stocked | — |
| Cagrilintide | Amylin analog | AMY / CTR | Not stocked | — |
Pair It for Comparative Research
GLP-3 RT + GLP-2 TRZ
- Triple vs dual: isolates the glucagon-receptor contribution.
- One supplier. One lab. One COA method. Fewer confounds.
- Study notes: GLP-3 RT vs GLP-2 TRZ.
- Stack toward free shipping at $200+ and 10% off at 10+ vials.
What GLP-3 RT Is Studied For in Preclinical Research
Energy expenditure
Glucagon-receptor arm. Expenditure beyond GLP-1 agonism in rodent models. Intact lipidation critical.
Body composition
DIO models. Fat-mass vs lean-mass endpoints. Triple vs dual arms.
Hepatic lipid metabolism
NAFLD/MASH models. Liver triglyceride quantification. Histological scoring.
Laboratory Storage & Handling
Lyophilized
- −20 °C. Long-term.
- Sealed. Dark. Desiccant.
- Minimize temperature cycling.
In solution (in vitro)
- Solvent: sterile water or 0.1–1% sterile acetic acid.
- Add down the vial wall. No vortexing.
- Gentle swirl. 5–10 minutes.
- Aliquot to single-use volumes. Store at −80 °C.
- No repeated freeze-thaw.
Full protocols: peptide storage guide · peptide half-life chart.
GLP-3 RT Legal & Regulatory Status (September 2026)
- Not FDA-approved. Investigational.
- Not scheduled. Not a controlled substance.
- Sponsor timeline: Eli Lilly plans a BLA submission in Q1 2027.
- Legal channel: Research Use Only labeling, in vitro work.
- Separate from compounding: 503A lists govern pharmacies, not RUO suppliers.
- Not permitted: human or veterinary administration.
Channel differences: research vs compounded peptides.
Verify Before You Buy
See the GLP-3 RT COA for the Current Batch
HPLC purity · Mass spec identity · Lot-matched · ILS Laboratories
View COAs
How to Securely Buy Research GLP-3 RT From Evo Peptides
- Create a verified account21+. Research-use acknowledgment.
- Review the lot COAOn the product page or the COA library.
- Pick a size15mg, 20mg, or 30mg. Multiples ship from one lot.
- Pay by cardCredit or debit. Dispute protection intact.
- Order before 3:00 PM CSTShips same day from Wisconsin. Tracked.
Frequently Asked Questions
What is the best place to buy GLP3 for research?
A US RUO supplier with lot-specific ≥99% HPLC, mass-spec identity every batch, a named independent lab, and card checkout. Evo Peptides: 99.27–99.91% purity, ILS Laboratories COAs, same-day Wisconsin shipping. View GLP-3 RT.
Is GLP-3 RT the same as retatrutide?
Yes. GLP-3 RT is the catalog name for LY3437943 (retatrutide). GLP3, GLP3-RT, and RT3 are the same molecule. Background: GLP-3 RT research guide.
How much does GLP-3 RT cost at Evo Peptides?
15mg $69.95 ($4.66/mg) · 20mg $89.95 ($4.50/mg) · 30mg $134.95 ($4.50/mg). Free shipping $200+. 10% off 10+ vials.
Is GLP-3 RT legal to buy for research in the USA?
Yes, under Research Use Only labeling for in vitro work. Not FDA-approved. Not a controlled substance. Not for human or veterinary use.
What must a GLP-3 RT COA contain?
HPLC ≥99% with chromatogram. Mass spec near 4,731 Da. Named independent lab. Lot number matching the vial. Test date within ~12 months.
Why avoid vendors that only take Venmo, Cash App, or Zelle?
No buyer protection. No dispute rights. Often a sign the vendor can't keep standard card processing.
Why does a 95% purity floor matter?
Up to 5% uncharacterized material. Truncated and de-lipidated species shift dose-response curves. Lot-specific ≥99% is the research-grade benchmark.
How fast does Evo Peptides ship GLP-3 RT?
Same day before 3:00 PM CST. Saturday before 9:00 AM Central. No Sunday shipping. Ships from Wisconsin.
What's the difference between GLP-3 RT and GLP-2 TRZ?
GLP-3 RT: triple agonist (GIP, GLP-1, glucagon), investigational. GLP-2 TRZ: dual agonist (GIP, GLP-1), FDA-approved compound. Different sequence, mass, and receptor profile.
How should GLP-3 RT be stored in the lab?
Lyophilized: sealed, dark, −20 °C. Solution: single-use aliquots at −80 °C. No repeated freeze-thaw. See the storage guide.
Selected References
- Coskun T, et al. LY3437943, a novel triple GIP, GLP-1, and glucagon receptor agonist for glycemic control and weight loss: from discovery to clinical proof of concept. Cell Metab. 2022. doi.org/10.1016/j.cmet.2022.07.013
- Jastreboff AM, et al. Triple-Hormone-Receptor Agonist Retatrutide for Obesity — A Phase 2 Trial. N Engl J Med. 2023. nejm.org/doi/full/10.1056/NEJMoa2301972
- Eli Lilly. TRIUMPH-5, NCT06662383. clinicaltrials.gov/study/NCT06662383
- HCPLive. Retatrutide meets Phase 3 weight-loss endpoints in 2 obesity trials (July 23, 2026). hcplive.com
- FDA. Bulk Drug Substances Used in Compounding Under Section 503A. fda.gov
Research Use Disclaimer — Evo Peptides products are sold for in vitro laboratory research use only. Not for human or veterinary use. Not intended to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the U.S. Food and Drug Administration. Nothing on this page constitutes medical advice or dosing guidance. Purchasers must be 21+ and acknowledge research-only intent.