Best Retatrutide Vendors 2026: Price Comparison + Safety Guide
Retatrutide has moved from niche GLP research compound to one of the most-searched peptides on the market in a little over eighteen months. Eli Lilly's phase 3 data has done most of the talking, but the supply side has caught up quickly — nearly every US-based research vendor now stocks it, and per-mg prices have dropped meaningfully since early 2025.
This guide covers where retatrutide currently stands in terms of pricing, which vendors are worth a closer look, and what to check before placing an order. For research use only. Not medical advice.
What Retatrutide Is
Retatrutide is a triple agonist — it activates GLP-1, GIP, and glucagon receptors in a single molecule. That third receptor is what sets it apart from semaglutide (single agonist) and tirzepatide (dual). In Lilly's TRIUMPH trials, retatrutide has produced larger weight-loss figures than either predecessor at matched timepoints.
It is not FDA-approved. Every vendor sells it labeled "for research use only," and the compound is only available through research-peptide suppliers.
You can read the full retatrutide safety profile on PeptidePrices for regulatory status, reported adverse effects, and storage notes.
Retatrutide Pricing Snapshot
Retatrutide is sold almost exclusively in 10mg vials. Per-mg price is the only number that matters for cross-vendor comparison — list price on a 10mg vial ranges from roughly $75 to $160 depending on the supplier, so it is worth the two minutes to normalize.
The vendors below all stock retatrutide as of this writing. They are listed alphabetically, not ranked, since price and stock change weekly. For a live sort by per-mg cost, see our retatrutide price comparison.
Amino Club — US-based, accepts credit cards, responsive customer service. Public COAs from an unnamed ISO 17025 lab. Mid-market pricing on reta. Shipping from within the US is a practical advantage for anyone who has had international orders get stuck in customs.
Apollo Peptide Sciences — Oxnard, CA. Triple-lab testing (Janoshik, Colmaric, MZ Biolabs) with batch-linked COAs. Apollo has a heavy GLP-1 focus in their catalog and is typically among the cheaper options on reta per mg.
Ascension Peptides — Also Oxnard, CA. Triple-CLIA-lab verification including LAL endotoxin — uncommon at this price tier. Trustpilot 4.8 on ~72 reviews. Slightly pricier than Apollo on reta, but the endotoxin paperwork is worth it for injectable research.
Evolve Peptides — Casper, WY. Newer vendor (2024) with Janoshik + LAL endotoxin testing. Broad GLP catalog including reta and cagrilintide. Reviews are still accumulating, but the published testing documentation is solid.
LeoLab Rx — Highest-rated vendor in our rubric (9/10), Janoshik-verified, purity-guarantee refund policy. Not an affiliate partner — listed here because they consistently stock reta at mid-pack pricing and the quality paperwork is among the strongest in the category.
Modern Aminos — Also 9/10. Three named labs (Vanguard, Chromate, Freedom Diagnostics), QR-code COAs on every vial, LAL endotoxin testing. Typically a touch more expensive than the value-tier options but strong verification.
SomaChems — Las Vegas, ~10 years in business, Janoshik-verified. Full LAL endotoxin panel. Currently running a 20% customer discount via code PEPTIDEPRICES, which puts them among the cheaper options on reta when the code is applied. Worth noting: SomaChems had a nasal-spray QC failure in 2025 — this is documented in their vendor detail page and worth reading before ordering.
Dosing Considerations in Research
Published phase 2/3 retatrutide protocols have used weekly subcutaneous doses escalating from 0.25mg up to 12mg. Research protocols typically follow similar titration schedules to manage GI side effects, which are the main adverse-event signal across the GLP class.
The retatrutide safety page covers reported AEs, storage (2–8°C reconstituted, stable at room temp lyophilized), and regulatory status in more detail.
This is informational only. Any human use is outside the scope of how these compounds are sold.
What to Look for in a Retatrutide Vendor
Six things actually matter when choosing a reta supplier:
Named third-party lab. "Independently tested" is marketing. A named lab — Janoshik, Colmaric, MZ Biolabs, Freedom Diagnostics — is verifiable. Ideally you can cross-reference the batch ID on the lab's own website.
Public COAs, not on-request. A vendor who only sends COAs after you email asking is filtering out casual buyers. Public COAs on the product page is the standard you should expect in 2026.
LAL endotoxin testing. Retatrutide is an injectable. Endotoxin contamination is the contamination you cannot detect by looking at the vial. Vendors that publish LAL results: Modern Aminos, Ascension, Evolve, SomaChems.
Batch linkage. The COA should reference the exact batch number printed on your vial. "Representative COA" documents are near-useless.
Cold-chain shipping on reconstituted product. Most vendors ship lyophilized, which is stable at room temperature — but if you are ordering pre-mixed, verify they ship with ice packs.
Refund policy on failed COAs. LeoLab Rx publishes a purity-guarantee refund. Most vendors quietly do the same if you complain with lab results in hand. It is worth asking before the first order.
Bottom Line
If you want the cheapest verified retatrutide, Apollo and SomaChems (with the 20% code applied) are usually at the bottom of the per-mg table. If you want the most exhaustive testing paperwork, Ascension and Modern Aminos are hard to beat. LeoLab Rx sits in between and is the safest default pick by our rubric.
The real answer changes week to week. The live retatrutide comparison sorts every tracked vendor by per-mg price in real time. You can also see how reta stacks up against tirzepatide or semaglutide side-by-side on our retatrutide vs tirzepatide page.
For research use only. Not medical advice.