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Independent GLP-1 Testing · Elyria, Ohio

Retatrutide, tested by an independent U.S. lab.

Retatrutide acts on three receptors instead of one or two, and it is new enough that even the published reference data is unreliable. Suppliers currently list at least three different molecular formulas for it, and a molecular weight that varies by more than 160 daltons depending on whose catalog you read. The official structure filed with the United States Adopted Names council gives one answer; a good deal of the market repeats another. We test against the filed structure, and material sold under this name varies more between vendors than anything else in our catalog. Identity, quantity, and purity are included in the base test. Endotoxin testing, sterility testing, and heavy metals testing are available as optional add-ons.

$195.00 per sample · signed COA
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How a sample becomes
a certificate.

Every retatrutide sample moves through the same five steps. No shortcuts for rush orders. No unnamed hands in the middle.

Intake.

Your sample arrives. We photograph it, weigh it, log every detail, and assign a tracking number that follows it onto every page.

Prep.

A named analyst prepares the run: dissolutions, dilutions, internal standards. Their initials go in the log.

Run.

HPLC-UV for purity, LC-MS for identity, and quantitative analysis for the amount present, with system-suitability standards bracketing your sample on either side.

Review.

A second analyst reviews the chromatogram independently. Nothing ships with one set of eyes on it.

Sign.

The COA is digitally signed, hashed, and published. Anyone with the link can verify the signature against the raw data.

What we look for

What we look for in retatrutide

That it is retatrutide and not a cheaper stand-in.

Tirzepatide is easier to make and sells for less. Relabelling it costs a vendor nothing. The two masses are not close, so the substitution is obvious once you measure it.

The impurity profile, not just the headline number.

Newer synthesis routes leave more related peptides behind. We report the purity as percent area and state the method that produced it, so the number can be compared to another lab's honestly.

Consistency between vials.

If you are buying repeatedly, testing more than one vial from a batch is worth more than testing one very carefully. Ask us about multi-sample pricing.

What you receive

Paper you can stake a reputation on.

01

A signed Certificate of Analysis

Identity, quantity, and purity on one document, signed by the director, not a template stamp.

02

Method-level transparency

Column, wavelength, ionization mode, and acceptance criteria are stated, not implied.

03

Public verification

Each COA carries a hash and signature anyone can check at our verify endpoint, on or off our site.

Related testing

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Frequently asked

Retatrutide testing, answered.

Does ECA test retatrutide samples?+
Yes. Erie Coast Analytical accepts retatrutide research samples through the catalog and returns analytical documentation once testing is complete. Identity is confirmed by mass spectrometry, quantity is measured, and purity is assessed by HPLC-UV.
Is retatrutide testing performed in the United States?+
Yes. All analysis is performed in-house at our laboratory in Elyria, Ohio. We are an independent U.S. lab. We don't outsource testing or ship samples overseas, and every result is produced and signed by our own analysts.
What does the retatrutide Certificate of Analysis include?+
The retatrutide documentation reports the measured intact mass against the expected mass, the measured quantity, HPLC-UV purity as percent area, the method parameters, and the analyst and director review. Where a result is ambiguous, the documentation says so instead of rounding it into a tidy number.
How long does retatrutide testing take?+
Typical turnaround is 24-48 hours from the day your sample is received at the lab. You'll get shipping instructions, a packing slip, and labels after checkout.
What methods are used for retatrutide identity, quantity, and purity?+
Identity is confirmed by LC-MS intact-mass analysis. Quantity is measured and reported separately from percent-area purity. Purity is measured by reversed-phase HPLC-UV and reported as percent area.
Retatrutide is new. Do you have a reference standard for it?+
Yes. We buy a reference standard and run your sample against it, which matters more for retatrutide than for anything else we test. Suppliers currently publish at least three different molecular formulas for this compound and molecular weights that disagree by over 160 daltons, so a lab working from catalog data alone may be measuring against the wrong target. We work to the structure filed with the United States Adopted Names council: C221H342N46O68, 4,731.33 daltons.
Is this medical or dosing advice?+
No. ECA provides analytical testing for research compounds only. We do not provide medical advice, dosing guidance, treatment claims, or clinical evaluation of any kind.
Erie Coast Analytical provides analytical testing services for research compounds and does not provide medical advice, dosing guidance, treatment claims, or clinical evaluation. Endotoxin testing, sterility testing, and heavy metals testing are available as optional add-ons. The interactive catalog remains the source of truth for current availability, checkout pricing, and add-on testing panels.