Best Retatrutide Suppliers in 2026: Tested, Priced, and Compared

Across the 20 vendors we track selling retatrutide right now, the same milligram of powder runs anywhere from about $3 to north of $30. That is a 10x swing on an identical molecule, and it is the single thing that makes "where do I buy retatrutide" so hard to answer well. The cheapest listings are bulk multi-vial packs aimed at someone splitting an order across a group. The most expensive are tiny single vials from sellers who never post a real lab result. We priced and scored all of them, and the sellers worth your money sit in the middle: third-party tested, shipping from inside the US, and charging $7 to $9 per milligram. If you want the short version, Orbitrex Peptides currently tops our retatrutide list, and we walk through the rest below.

This is also the moment retatrutide stopped being a niche research curiosity. On May 21, 2026, Eli Lilly reported topline results from TRIUMPH-1, its first pivotal Phase 3 obesity trial, and the numbers were the largest any obesity drug has posted. So interest is spiking right as the buying market is at its messiest. Good timing to slow down and pick well.

The price spread is the whole problem

Retatrutide is a triple agonist, meaning it hits three receptors at once (GLP-1, GIP, and glucagon). It is structurally complex, which matters for two reasons. First, it is harder to synthesize cleanly than a commodity peptide like BPC-157, so purity actually varies between sellers. Second, that complexity makes a real lab test essential: an HPLC purity number alone does not confirm the molecule is even retatrutide. You want mass-spec identity confirmation on the certificate.

Here is where the price spread bites. A $25 to $34 per milligram single vial with no posted certificate is the worst of both worlds, expensive and unverifiable. A $3 per milligram bulk pack from a Finnrick-tested seller is a genuinely good deal if you can use that much. Most people land best somewhere in between. We weight third-party lab testing heaviest in our scoring, then price per milligram, then US shipping, reputation, and payment options, and the vendors that clear all of those cluster at $7 to $9 per milligram.

The sellers we would actually point you to

Every name below carries retatrutide today, ships to US addresses, and posts third-party COAs. We linked each one so you can open the scorecard and check the lab tier, the price, and the rating yourself.

Top of our list: Orbitrex Peptides

[Orbitrex Peptides](/vendor/orbitrex-peptides) earns one of the highest vendor scores we publish, just above 9 out of 10, and it sells retatrutide at $79.99 for a 10 mg vial, roughly $8 per milligram. It uses Finnrick, the lab tier we trust most, and ships from Flower Mound, Texas, so there is no customs gamble. For a first order where you want the cleanest combination of testing and price, this is where we would start.

Best value if you buy in volume: Peptide Partners

[Peptide Partners](/vendor/peptide-partners) lists a 480 mg pack (twenty 24 mg vials) that works out to about $3.15 per milligram, the lowest verified price in our data. That is a group-buy or long-protocol quantity, and it is Finnrick-tested and US-based. If you already know retatrutide works for your protocol and you want the cost floor, this is it.

Cheapest single vial we still trust: Coastal Peptides

For a normal single-vial order, [Coastal Peptides](/vendor/coastal-peptides) sells a 30 mg vial at $210, about $7 per milligram, with Finnrick testing and US shipping. [Certified Peptides](/vendor/certified-peptides) sits right next to it near $7.33 per milligram on a 30 mg vial. Both give you a real lab result at the low end of the sane price range.

Lab-transparency standouts: NuLife and Skye

[NuLife Peptides](/vendor/nulife-peptides) and [Skye Peptides](/vendor/skye-peptides) both post Finnrick COAs and ship from the US, NuLife from a 24 mg vial around $9 per milligram and Skye out of Los Angeles at a similar price. Neither is the rock-bottom option, but both score well on testing and reputation, which is what you are really paying for with a complex molecule like this one.

What a great retatrutide seller looks like

Strip away the branding and a good seller comes down to four things you can verify in about five minutes:

You can see how every vendor stacks up on these against each other on our [retatrutide page](/peptide/retatrutide) and the broader [full vendor rankings](/vendors).

Where retatrutide actually stands right now

Retatrutide is the most exciting thing in the obesity-drug pipeline, and the Phase 3 data is why. In TRIUMPH-1, announced May 21, 2026, adults on the 12 mg dose lost an average of 28.3% of their body weight over 80 weeks, against 2.2% on placebo, with the 9 mg and 4 mg doses at 25.9% and 19.0%. Participants who started with a BMI of 35 or higher and stayed on the drug reached 30.3% at 104 weeks. That builds on the 2023 NEJM Phase 2 trial (Jastreboff et al.), where the 12 mg dose produced a 24.2% reduction at 48 weeks. Lilly plans to present the full TRIUMPH-1 dataset at the American Diabetes Association Scientific Sessions.

One honest caveat to keep in front of you: retatrutide is still investigational and is not FDA approved. Lilly's own language is that it is legally available only to clinical-trial participants, and additional Phase 3 readouts (TRIUMPH-2 and TRIUMPH-3) are expected later in 2026. Everything sold by the vendors above is sold for research use. We score sourcing and quality; the medical and legal calls are yours to make with a clinician.

How we line these up

We score every vendor on a 0 to 10 model that weights third-party lab testing most heavily, then price per milligram, US availability, reputation, catalog depth, and payment flexibility. We compare and rate sellers using their own published prices and lab data. We do not manufacture, sell, or run our own purity tests. If you want the full ranked retatrutide list with live prices, it lives on our [retatrutide page](/peptide/retatrutide), and the GLP-1 family comparison is in our [semaglutide vs tirzepatide breakdown](/blog/semaglutide-vs-tirzepatide).

Sources

Eli Lilly, TRIUMPH-1 Phase 3 topline results (May 21, 2026): https://www.prnewswire.com/news-releases/lillys-triple-agonist-retatrutide-delivered-powerful-weight-loss-in-pivotal-phase-3-obesity-trial-302778859.html

AJMC, Retatrutide Achieves Up to 30.3% Average Weight Loss in Phase 3 TRIUMPH-1 Trial: https://www.ajmc.com/view/retatrutide-achieves-up-to-30-3-average-weight-loss-in-phase-3-triumph-1-trial

Jastreboff et al., Triple-Hormone-Receptor Agonist Retatrutide for Obesity, A Phase 2 Trial, NEJM 2023 (PMID 37366315): https://pubmed.ncbi.nlm.nih.gov/37366315/

New England Journal of Medicine, full Phase 2 trial text: https://www.nejm.org/doi/full/10.1056/NEJMoa2301972

PeptidesRated retatrutide vendor comparison and pricing: https://peptidesrated.com/peptide/retatrutide

PeptidesRated COA lookup tool (Janoshik, Finnrick, Freedom Diagnostics): https://peptidesrated.com/coa