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Buy Retatrutide for Research: 2 Vendors Compared (Prices, COAs)

Checked, not rated · Updated 3 October 2026

Retatrutide is not approved by FDA for human use, and it is sold in the US labelled for research use only. 2 of the 3 vendors I check sell it online (Next Level Pharm and Spartan Peptides), from $63.99 for a 10 mg vial as of 3 October 2026.

The table compares vendors on FDA record, testing lab, batch COAs and price. Before buying from anyone, run my vendor checklist.

Class
Triple GIP/GLP-1/glucagon receptor agonist
Background
Investigational in Phase 3 trials for obesity, type 2 diabetes and related conditions.
Human evidence
Moderate human evidence

The evidence, risks and legal detail: my Retatrutide guide. Dosing and vial maths: Retatrutide dosage.

Retatrutide vendors compared

The checklist results come from my review of each vendor and cover the whole store. A vendor can publish COAs for some products and not others. The featured vendor is pinned first; the order is not a ranking.

Vendors selling Retatrutide for research use, compared on product, price, FDA record, testing lab, batch COAs and card payment
VendorProductPriceFDA recordNames its labBatch COAsCard paymentLink
Next Level PharmFeaturedMy Next Level Pharm review10 mg vial$63.99as of 3 October 2026No warning letter foundYesYesYesView product →
Spartan PeptidesMy Spartan Peptides reviewGLP-3(Reta) 6 mg vial$180.00as of 3 October 2026No warning letter foundYesNot verifiedNot verifiedView product →

Prices are for the product named, as shown on the vendor's own product page on the date given. They change often. Checklist results were verified on 3 October 2026. All vendors and how they compare.

What a Retatrutide COA should show

A certificate of analysis (COA) is the lab report for one batch. For retatrutide, check these:

  • Identity by mass spectrometry, with the expected and the measured mass side by side. For retatrutide, expect about 4,731.4 Da (C221H342N46O68).
  • Vendors often sell it under a code name such as GLP-3 or Reta. The COA should still name retatrutide and report its mass.
  • Purity by HPLC for this batch, shown as a chromatogram as well as a percentage.
  • A lot number that matches your vial or pack, the test date and the lab's name, so you can confirm the certificate on the lab's own site.

A purity figure does not cover sterility or bacterial endotoxins; a COA covers those only if it reports separate tests for them. Line by line: how to read a peptide COA.

Red flags when buying retatrutide

  • A seller offering retatrutide as a weight-loss treatment, or a clinic offering it compounded.
  • Any claim that the vial is Eli Lilly's trial drug.
  • No certificate of analysis for the batch you will receive, or one without a lot number or a named lab.
  • Dosing instructions or treatment claims for people on the product page.
  • An FDA warning letter naming the seller. Search fda.gov before you pay.
  • No way to pay with buyer protection, such as a credit card.

Common questions

Is retatrutide available in the US?

Not as an approved medicine. Eli Lilly provides it through clinical trials and, since August 2026, an early-access programme. Lilly plans to submit a biologics license application to FDA in the first quarter of 2027. Vials sold online as research retatrutide are not the trial drug.

How do you qualify for retatrutide?

Through a Lilly clinical trial, or through Lilly's early-access programme, which takes requests from doctors. As reported in August 2026, a patient must be 18 or older, unable to join a trial, and have refractory obesity with 2 or more serious complications.

Can I get compounded retatrutide?

No. FDA says retatrutide cannot be used in compounding under federal law. It adds that retatrutide is not a component of any FDA-approved drug and has not been found safe and effective for any condition. FDA has warned telehealth companies, ingredient distributors and outsourcing facilities over it.

Where can I buy retatrutide?

Online, from research vendors that label it for laboratory use only. I list 2 checked vendors: Next Level Pharm and Spartan Peptides, from $63.99 for a 10 mg vial as of 3 October 2026. Before you pay, confirm the batch COA on the testing lab's own site.

Is retatrutide for sale legally?

Retatrutide is sold in the US labelled for laboratory research use only. It is not approved by FDA for human use, and it cannot lawfully be marketed as a supplement or a medicine. FDA says it has warned companies that illegally sold unapproved drugs containing retatrutide falsely labelled "for research purposes" or "not for human consumption". A research label does not make selling it for human use lawful. This is general information, not legal advice.

Do I need a prescription for retatrutide?

No US-approved retatrutide product exists for a doctor to prescribe. Research vendors sell it without a prescription, labelled for laboratory use only.

How much does retatrutide cost?

On the vendors' own product pages: Next Level Pharm, 10 mg vial, $63.99 (as of 3 October 2026); Spartan Peptides, GLP-3(Reta) 6 mg vial, $180.00 (as of 3 October 2026). Prices change often, so check the product page before you rely on one.

How do I know if retatrutide is real?

Only a lab test can tell you. Ask for the certificate of analysis (COA) for your batch, and confirm it on the testing lab's own site. The mass spectrometry result should match the expected mass of retatrutide, about 4,731.4 daltons (C221H342N46O68). A vendor's COAs for other products say nothing about this one, so check that the certificate names retatrutide and your lot number.

Who sells the best retatrutide?

I don't rank vendors, so I don't name a best one. Compare what each lets you check: a named testing lab, a COA for your lot that the lab confirms on its own site, and no FDA warning letter. The table shows my checklist result for each vendor. A vendor that passes every check can still ship a bad batch.

Sources