Research peptides · tested lot by lot

Purity you can verify.

Retatrutide leads a catalog of 17 research peptides. Every lot is tested for HPLC purity and mass-spec identity, and can’t be sold until its certificate is published. The lot number on your vial opens that same record.

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Release minimum: 99.0% HPLC purity
On every lot: HPLC + MS purity and identity
Before sale: Certificate published

A Retatrutide vial in front, with BPC-157 and TB-500 behind it, on a black studio floor — Render Retatrutide in front · 3 mL vials · 13 mm crimp seal

Verify a vial

Check a lot number against its certificate.

Flagship · Incretin & glucagon receptors

Retatrutide

LY3437943 39 residues C-terminal amide

A synthetic, lipidated 39-residue peptide that acts on three receptors: GIP, GLP-1 and glucagon.

Research use only Not an approved medicine

Average mass: 4731.348 Da
Formula: C₂₂₁H₃₄₂N₄₆O₆₈
Vial sizes: 5 · 10 · 20 mg
Released at: 99.0% or more (HPLC)
Current lot: Loading this lot’s record

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Release standard

Below 99.0%, no lot ships.

A lot is published only when its certificate shows HPLC purity at or above our release minimum and a mass that matches its sequence. The store enforces it: a lot that misses can’t be listed, and nothing without a passing lot can be bought.

Lots by HPLC purity

Preview · example data

These dots are examples, including one refused lot to show the rule at work. Published lots replace them, each plotted from its own certificate.Each dot is a published lot, plotted from the HPLC purity on its own certificate. Hover over or tap a dot to read its lot and test date.Each dot is a published lot, from its own certificate. A red dot is below today’s minimum, so it isn’t on sale. Hover over or tap a dot to read it.Each dot is a published lot, from its own certificate. A red dot misses today’s rules, so it isn’t on sale. Hover over or tap a dot to read it.

This chart plots every published lot against the release minimum. It needs JavaScript.

Certificate explorer

Read a certificate like the lab does.

Pick a peptide, then trace the chromatogram and the mass spectrum. Purity is the main peak’s share of the signal; identity is checked by its mass: the one it should have, next to the one it has.

Certificate of analysis

Example

Retatrutide

Example valuesLoading the lot record

HPLC purity: Loading
Release minimum: Loading
Average mass, calculated: 4731.348 Da
Average mass, observed: Loading
Difference: Loading
Tested: Recorded per lot
Laboratory: Recorded per lot
Method: RP-HPLC (UV 220 nm); ESI-MS

These are example values, showing what a certificate reports. When this peptide has a published lot, its own numbers replace them.The live lot data couldn’t load, so these are example values, showing what a certificate reports. Refresh to see this peptide’s lot.This lot’s record falls short of today’s release rules, so it isn’t on sale. Its record stays on Verify, so its vials still check out.Drawn from this lot’s certificate, which is the record; these charts illustrate the purity and the mass that it reports.Drawn from this lot’s recorded results. Its certificate file isn’t published yet, and the lot can’t be sold until it’s on file.Drawn from this lot’s recorded results. Its record isn’t complete yet, so the lot isn’t published, and it can’t be sold until it is.Drawn from an earlier lot’s certificate, this peptide’s newest published one. It is the record; these charts illustrate what it reports.Drawn from an earlier lot’s certificate. That lot is retired, so it isn’t on sale; its record stays on Verify, so its vials still check out.Drawn from a retired lot’s certificate. Its record falls short of today’s release rules; it stays on Verify, so its vials still check out.

How to read a certificate View Retatrutide

The explorer draws each peptide’s chromatogram, spectrum and sequence. It needs JavaScript.

The catalog

Documented before it’s sold.

Shop all 17 peptidesView all 17 peptides

Retatrutide Flagship

5 mg · 10 mg · 20 mg · 4731.348 Da

Research use only Not an approved medicine

BPC-157

5 mg · 10 mg · 1419.536 Da

TB-500

5 mg · 10 mg · 889.005 Da

GHK-Cu

50 mg · 100 mg · 401.908 Da

How a lot reaches you

Five steps, one record.

From synthesis to the vial in your hand, each lot keeps one number. Every step below is attached to it.

Made to its published sequence

Each peptide is synthesized to the exact sequence on its page, purified, then freeze-dried into a sealed vial. The sequence and the mass it implies are public before you buy.

Explore a sequence

Purity and identity, measured

HPLC separates the sample and measures the main peak’s share of the signal. Mass spectrometry weighs the molecule: a sample more than 1.0 Da off its sequence’s mass can’t pass, however pure.

How to read a certificate

Never released below the minimum

The certificate goes on file with the lot. Below the release minimum, or with a mass that doesn’t match its sequence, the store won’t publish it.

The release standard

Sealed and labelled with its lot

Vials are crimp-sealed under a flip-off cap and labelled with the lot number, so the vial and its record can’t drift apart.

Storage and handling

A labelled Retatrutide vial: flip-off cap, crimp seal and the printed label

Check the vial in your hand

Type the lot number from the label into Verify. You’ll see the same record we published before the lot went on sale, and the certificate itself.

Verify a lot

Why researchers can check us

Proof before payment.

No certificate, no sale

A lot can’t be listed until its HPLC purity, observed mass, test date, laboratory and certificate file are all on record.
Our quality standard
Published sequences

Every listing shows the full sequence and the mass and formula computed from it, so identity has something to be checked against.
Sequence Studio
Private checkout

No ad trackers or third-party scripts on any page. Order details are encrypted where they’re stored.
Privacy policy
Corrections on record

A published value is never changed quietly: each correction shows on the lot’s Verify record, with its date, the old and new value, and the reason.
Verify a lot

FAQ

Questions, answered.

How testing, ordering and shipping work.

All questions

What does “research use only” mean?

Our peptides are supplied as laboratory reagents for research by qualified buyers. None is approved as a drug, food, supplement or cosmetic in the form we supply it, and none is for human or veterinary use.

We don’t give advice about using peptides in people or animals, and product pages describe what each compound is and how it is studied, never what it does to a person.

Research-use policy

How do I know what’s in the vial?

Every lot we sell has a certificate of analysis on file, showing HPLC purity and mass-spectrometry identity for that exact lot. It is linked on the product page before you buy.

The lot number printed on your vial opens the same record on our Verify page, so you can match the vial in your hand to its test results.

What does an HPLC purity figure tell me?

High-performance liquid chromatography separates a sample into its components. Purity is the main peak’s share of the total detected signal, usually measured by UV absorbance around 214–220 nm.

It measures the main component against peptide-related impurities; it isn’t net peptide content, which also accounts for water and counter-ions.

What HPLC purity means

How should lyophilized peptides be stored?

Follow the storage and transport requirements documented for the specific lot. Do not assume that every peptide can be shipped at room temperature or has the same freezer shelf life.

Once a peptide is in solution it is far less stable; our storage guide covers handling in more detail.

Storage and handling guide

How do I pay, and when does my order ship?

The available payment methods are listed at checkout. A research request first enters review, with no payment due. Payment instructions appear only after verification and approval. Sample requests cannot be paid or fulfilled.

Orders are packed once payment clears. You can follow every step on the order page or with your order number on Track an order.

Ready when you are

Every lot on sale has its certificate.

Every listing shows its sequence. A lot without a published certificate isn’t for sale.Read it, check the sequence, then order. A lot without a published certificate isn’t for sale.No lot is on sale yet: each goes on sale only once its certificate is published.Nothing is on sale right now. Every sequence and published certificate stays open to read.

Shop all 17 peptidesView all 17 peptides See current dealsWhy choose us

Purity you can verify.

Check a lot number against its certificate.

Retatrutide

Below 99.0%, no lot ships.