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c/retatrutide·posted 5 months ago by u/careful_gradient32

phase 2 — 18 things I got wrong before I got it right

Discussion Slow Clap ×5 Receipts ×1

phase 2 — 18 things I got wrong before I got it right. Making the case below, and I expect to lose some of it in the comments.

The phase 2 readout ran to 48 weeks in a few hundred participants with a slow escalation. Both the size and the duration matter when people quote the headline number.

Glucagon receptor agonism is associated with increased energy expenditure and with hepatic effects. That is a mechanistic story with strong preclinical support and limited phase 2 human data.

It is a triple agonist at the GLP-1, GIP and glucagon receptors. The glucagon arm is the genuinely novel component and it is the one with the least human outcome data behind it.

If somebody has the same thing measured a different way, post it next to mine and we will see whether they agree.

1,763 up / 284 down86% upvoted35 commentsid vcwm9b22 Feb 2026

35 comments

19 in this archive, depth 5

best — the order this archive was captured in

u/incretin_ivypharmacology246 points·5 months ago

Nothing containing this compound is approved anywhere. Research-use-only material is not approved for human use, and that is a statement of fact rather than a disclaimer.

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u/heart_rate_bump125 points·5 months ago

Careful with the rankings. A phase 2 result and a phase 3 result are not on the same evidential footing and cannot be listed in one table.

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u/farid_molnar79 points·5 months ago

Agreed on the heart-rate reports. They are consistent enough across the threads to be worth noting, not enough to be a finding.

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u/rekha_vestergaard89 points·5 months ago

the glucagon component is why the metabolic story reads differently

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u/yusuf_ramos114 points·5 months ago·edited

Sceptical of the extrapolation. Forty-eight weeks does not tell you about seventy-two, and the curve shape is exactly what is unknown.

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u/careful_gradient_notes85 points·5 months ago

What do you think the glucagon component is adding, specifically?

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u/ledger_modmod · vetting38 points·5 months ago

Push back: quoting the phase 2 headline as an expected outcome is not a fair reading of a small trial with wide intervals.

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u/mod_cold_roommod · c/coldchain9 points·5 months ago

Agreed, and the framing that helps is: this is a phase 2 compound with phase 3 running. Everything else is inference.

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u/careful_gradient32OP-3 points·5 months ago

Agreed, and the framing that helps is: this is a phase 2 compound with phase 3 running.

Agreed, and the glucagon arm is exactly why the comparison threads do not work.

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u/baseline_drifteranalytical1 point·5 months ago

Disagree. "More receptors means more effect" is not how any of this works and the trial data does not support the linear story.

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u/fabio_lehtinen12 points·5 months ago

the energy-expenditure story is mechanistically interesting and clinically unproven

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u/careful_gradient32OP0 points·5 months ago

Correcting my own comment above: that figure was the 36-week interim, not the 48-week endpoint.

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u/careful_gradient32OP1 point·5 months ago

Correction: TRIUMPH is the phase 3 programme. The number you are quoting is from the phase 2 readout, which is a different trial.

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u/marit_laurent55 points·5 months ago

Are you comparing against phase 3 numbers for something else? They are not comparable.

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u/sena_teixeira19 points·5 months ago

Is that the 48-week figure or an earlier readout?

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[removed]14 points·5 months ago

[removed by moderator]

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u/honest_syringe3316 points·5 months ago

research-use-only material is not approved for human use, full stop

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u/elodie_grimaldi28 points·5 months ago·edited

Are you tracking heart rate at all?

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u/rui_only_ro24 points·5 months ago

Went up slowly, deliberately, because everything on this board says the escalation is where trouble lives. Uneventful so far and I am not going to pretend that is a finding.

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About c/retatrutide

Retatrutide: GIP/GLP-1/glucagon triple agonism, the TRIUMPH programme, and the fact that most people discussing it are handling research-grade material with no human-use approval anywhere. Dose-response, heart-rate signal, and the unusually steep phase-2 weight curves get argued about here weekly.

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