What should you check before buying research retatrutide?
Retatrutide is one of the most searched research peptides in Mexico, and one of the hardest to compare. Every shop sells a different vial size, almost all of them say "≥99% HPLC," and very few explain what's behind that number. This guide helps you compare quotes with real numbers and know what to ask before you pay.
The short answer
When you ask for a retatrutide quote, get these in writing: milligrams per vial, the total price with shipping, the batch number and its COA, and confirmation that it's sold as research material (RUO). To compare, divide the price by the milligrams and add shipping. And don't settle for "99%": ask for the batch chromatogram and the measured mass, which for retatrutide is about 4,731 daltons.
What should I ask for when buying retatrutide?
- Milligrams per vial. You'll find 10, 15, 20, 30 mg vials and bigger. Without this number, the comparison is useless.
- Lyophilized form. Dry powder in a sealed vial. That's how research retatrutide is sold.
- Total price. Product, shipping, and payment fees, all together.
- Batch number and its COA. For the vial they're actually sending you, not a sample document.
- Delivery time and a tracking number.
- Stated use. It should clearly say it's for research only. If they give you instructions for personal use, that's not a lab supplier.
A naming detail that trips a lot of people up: retatrutida and retatrutide are the same molecule (it also shows up as LY3437943). "Retatrutida" is the Spanish name. And plenty of people just call it "reta."
How do I compare retatrutide between suppliers?
Work it out per milligram and add shipping. Here's how two real quotes for 10 mg vials look, using prices published in October 2026:
| 10 mg vial | Price | Per mg | One vial with shipping |
|---|---|---|---|
| Égida | $1,100 MXN | $110 | $128 per mg ($180 shipping) |
| Another Mexican shop | $1,400 MXN | $140 | $160 per mg ($199 shipping) |
To be fair: that other shop also sells large vials, and with its 60 mg vial the price drops to about $68 per milligram. At Égida we only carry the 10 mg vial right now. If your work needs a lot of material, a big vial may come out cheaper per milligram. If you need a little, paying for a 60 mg vial you won't finish isn't saving money.
Shipping matters too. At Égida it's free over $2,000 MXN, so two vials in one order already ship free. The 10 mg retatrutide has its current price on the product page.
What does "≥99% HPLC" mean for retatrutide?
Almost every supplier says it, so it no longer helps you tell one from another. That percentage measures how much of what the instrument detected belongs to the main peak on the graph. It doesn't tell you how many milligrams of retatrutide are in the vial, because the powder also contains salts and water, and on its own it doesn't confirm the molecule is retatrutide either.
So when you look for retatrutide suppliers with 99% or higher HPLC, ask for these three things together:
- The batch chromatogram. The graph the percentage comes from.
- The mass by mass spectrometry. Retatrutide weighs about 4,731 daltons. A measured value close to that confirms it's the right molecule.
- Who ran the analysis and when.
If you want to really understand the difference between "peak purity" and "vial content," it's explained in what HPLC purity means.
What should a retatrutide batch COA include?
A useful Certificate of Analysis covers the exact batch you're going to receive. At a minimum it should have:
- Compound name (retatrutide or retatrutida) and batch number.
- Date of analysis.
- HPLC purity, with the chromatogram attached.
- Mass measured by mass spectrometry, close to 4,731 Da.
- Name of the lab that ran the tests.
Some COAs also report peptide content, water, or endotoxins. That's useful extra information, but the list above is the basics. When the vial arrives, the printed batch number should match the one on the document. The guide to reading a COA walks through each section step by step.
What are the red flags?
- A "COA" with no batch number, or the same document for every vial size.
- Pens, drops, or pre-filled syringes. Research retatrutide is sold as powder in a vial.
- Promises of results in people or instructions on how much to take.
- A price that doesn't line up with anyone else's, far below the rest of the market.
- Being told it's "the same as the pharmacy one." There is no pharmacy retatrutide, as we explain below.
Is retatrutide an approved drug yet?
No. As of October 2026, retatrutide is still in clinical trials and is not approved as a drug in Mexico or the United States. That means there's no pharmacy version: any product offered to you for personal use is not an authorized medicine.
The retatrutide Égida sells is research material in a lyophilized vial. It is not intended for human consumption and we don't sell it for personal use. More detail on our compliance page.
How does shipping and delivery work?
We ship from Guadalajara to anywhere in Mexico in 24 to 72 business hours, with a tracking number and plain packaging. How it works step by step is in how a peptide order arrives.
When it arrives, check that the powder looks dry, the seal is intact, and the printed batch number is readable. For storage, follow the guide on how to store peptides, and for concentration use the reconstitution calculator.
If you're deciding between the two molecules, retatrutide vs tirzepatide compares them, and if you're also getting a quote on the other one, see what to check before buying research tirzepatide or the product page for 5 and 10 mg tirzepatide.
Sources
- Drugs.com. Retatrutide FDA Approval Status. drugs.com
- Reference prices: public product pages checked on October 12, 2026.