Retatrutide 20mg

This page lists the Retatrutide 20mg vial specifically: double the peptide payload of our standard listing, from a single lot, for laboratories running longer in-vitro protocols. "Reta" is the shorthand researchers use for retatrutide (LY3437943). If you are searching more generally for retatrutide rather than for this fill size, our Retatrutide 10mg vial is the standard listing you are looking for — the same synthesis, the same ≥98% HPLC specification, the same third-party certificate, at the smaller fill and the lower vial price.

If your protocol runs long enough that a lot change partway through would become a variable you have to control for, the Retatrutide 30mg is the single-lot option. All three are supplied as sealed vials of lyophilised powder that the researcher reconstitutes; there is no other presentation of retatrutide in this catalogue.

The 20mg presentation doubles the peptide payload per vial without changing any aspect of synthesis, purity specification or third-party verification. What it changes is arithmetic: twice the working volume at the same reconstitution concentration, one lot number covering twice as much work, one certificate to file instead of two, and a lower cost per milligram.

It is the fill for multi-week receptor pharmacology, concentration–response series within a single arm, or extended adipocyte and hepatocyte assays where consolidating lot handling reduces analytical noise and cost per data point. What it does not change is the material: a 20mg vial is the same compound at the same specification as a 10mg vial, in a larger fill.

The 20mg vial supports roughly twice the protocol duration of the 10mg at identical reconstitution concentrations. Typical use cases include:

Store the lyophilised vial at -20°C in its sealed container, protected from light and moisture, and allow it to reach room temperature before opening so condensation cannot enter the vial.

A lipidated peptide is prone to denaturing at an air–liquid interface, so foaming matters here more than it would for a short unmodified sequence. Refrigerate the reconstituted solution at 2–8°C and use within 28 days; do not refreeze. These are solvent volumes for putting powder into solution, not doses.

Every Retatrutide 20mg vial dispatched is covered by a signed PDF Certificate of Analysis from an accredited independent laboratory, covering HPLC-UV purity (≥98%), mass-spectrometry identity, residual solvents and visual inspection. The certificate published on this page corresponds to the exact lot you will receive, it is indexed on our lab reports page, and the lot number on the vial and the lot on the certificate always match.

One caution belongs with it: retatrutide has no resolvable PubChem record, the CID widely circulated for it returns tirzepatide, and the mass usually quoted for it is reported rather than verified. Read the mass from the certificate for your lot and check it by mass spectrometry rather than against a published reference figure.

The three fills are the same compound, the same synthesis route and the same ≥98% HPLC-UV specification. What differs is the fill weight, the rate per milligram and how long one lot number lasts. The 10mg is the entry vial and our standard listing, at £49.99 or £5.00 per milligram.

This 20mg vial is £89.99, or £4.50 per milligram, and suits an extended single-arm protocol. The 30mg is £124.99, or £4.17 per milligram — it holds the lowest per-milligram figure of the three, not this vial — and it exists for studies long enough that a lot change would otherwise become a variable to control for.

All prices are per vial; there is no monthly or course price for any fill, because a monthly figure would presuppose a person on a schedule. One point of difference worth knowing before ordering: the 10mg and 20mg lots each have a signed certificate published on their product page, and the 30mg lot's is not yet published.

The prices on each product page are authoritative if this section ever falls behind them.

UK Peptides is a UK-stocked, UK-dispatched research peptide supplier with a registered UK address behind the sale — no overseas customs step, no grey-market sourcing, no anonymous fulfilment. Same-day dispatch on orders placed before 6pm GMT on a working day, Royal Mail Tracked 24, and a signed third-party certificate published on the page for the lot in the box.

What we are not is equally clear: not a pharmacy, not a prescriber, not a clinic. We supply lyophilised research material, and nothing in this catalogue is sold as a treatment.