Who the trials did not enrol, and why that bounds the result

Published 24 October 2026 · REVIVE LAB UAE Research Desk · 5 min read
The NEJM obesity trial enrolled adults with obesity or overweight with a weight-related condition and excluded those with diabetes; the Lancet trial enrolled adults with type 2 diabetes on diet or metformin. Both excluded a range of other conditions and medications. The results describe the populations enrolled and are generalised beyond them only by assumption.

What exclusion criteria do

They define the population so that the result is interpretable and the participants are not exposed to foreseeable risk. Excluding people with diabetes from an obesity trial keeps glycaemic effects from confounding the weight question and the safety profile cleaner. Excluding certain prior conditions protects participants and keeps adverse-event attribution clear.

They are necessary and they narrow the population.

What the two trials excluded

The obesity trial required a body-mass index of 30 or more, or 27 or more with a weight-related condition, and excluded diabetes among other conditions. The diabetes trial required type 2 diabetes managed without insulin and set glycated haemoglobin bounds. Both excluded recent weight change, certain medications and a list of medical histories given in the protocols.

The full criteria are in the supplementary material of each paper.

What follows

A result in people with obesity and no diabetes is not a result in people with both. A result in people with diabetes on metformin is not a result in people on insulin. Phase 3 programmes broaden enrolment partly to close these gaps, and until they report, the phase 2 populations are the populations the evidence describes.

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.

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Frequently asked

What exclusion criteria do?

They define the population so that the result is interpretable and the participants are not exposed to foreseeable risk. Excluding people with diabetes from an obesity trial keeps glycaemic effects from confounding the weight question and the safety profile cleaner. Excluding certain prior conditions protects participants and keeps adverse-event attribution clear.

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
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Related reading

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