A half-life measured in days, and what the trials built on it

Published 24 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
Half-life is the time for circulating concentration to fall by half. For retatrutide it is measured in days, a consequence of albumin binding through its fatty-acid side chain, and it was characterised in the phase 1b trial reported in The Lancet in 2022. That duration is what the administration interval used throughout the clinical programme rests on.

What half-life is and is not

Half-life describes how fast a compound is cleared, from which the time to reach steady state and the fluctuation between administrations follow. It is a property of the molecule in a population, and it varies between individuals.

It is not a measure of effect. Two compounds with identical half-lives can differ entirely in what they do.

How it was established

In the multiple-ascending-dose study, concentrations were sampled over time after administration and the decline fitted to derive the half-life. The result — on the order of six days — was consistent with the design intention and with the dual agonist that preceded it.

That figure is why every subsequent trial administered the compound at a fixed interval matched to it: that allows an approach to steady state over several intervals and limits fluctuation within each.

Why it matters beyond the clinic

A long half-life means slow onset and slow offset. Effects persist after a final administration for a period governed by the same kinetics, which is relevant to how trials assess adverse events and to how washout is handled.

None of this is dosing guidance. It is the pharmacokinetic description that the published trial designs are built on, and it is in the primary literature.

Supply

Retatrutide is supplied by REVIVE LAB UAE as an investigational research material for laboratory use only, with identity by mass spectrometry and purity by HPLC for the batch. It is not approved for any use anywhere, and no dosing, administration or protocol guidance is provided.

What it costs

FormatStrengthPriceAvailability
Retatrutide Pack20 mgAED 1010In stock

Delivery is AED 40 flat and free on orders over AED 700. Payment is cash on delivery anywhere in the UAE, or USDT (TRC20) in advance, which takes 5% off the order total.

Frequently asked

What half-life is and is not?

Half-life describes how fast a compound is cleared, from which the time to reach steady state and the fluctuation between administrations follow. It is a property of the molecule in a population, and it varies between individuals.

Does REVIVE LAB UAE provide dosing guidance?

No. REVIVE LAB UAE supplies research materials and provides no dosing, administration or protocol guidance of any kind. Every product is sold for laboratory research use only and is not for human or veterinary consumption.

How fast is delivery in the UAE?

Stock is held in Dubai. An order confirmed before 4 PM Dubai time is dispatched the same working day, reaching Dubai and Abu Dhabi the same day and the remaining emirates within 24 hours. Delivery is AED 40 flat and free over AED 700.

Retatrutide Pack — in stock, dispatched from Dubai
HPLC-verified, lot certificate on every carton, 24-hour delivery nationwide. Browse the catalogue → All peptides UAE

Related reading

Supplied for laboratory research use only. Not for human or veterinary consumption. REVIVE LAB UAE provides no dosing, administration or protocol guidance.