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Compounds · Retatrutide · continued

[2026 update] What we do not know about retatrutide, listed explicitly posts 61–84

This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.

V
VThorvaldsenTL3Regular23 Aug 2025#61

Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is why this subcategory is written more cautiously than the others.

That holds for the case as described. Change the assumptions and it may not.

8 likes 11mo
IB
i.brobergTL224 Aug 2025#62

I read post #60 twice before replying, because I had assumed the opposite.

Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from the dual agonists at equipotent effect, because equipotence has not been established either.

I would want a second opinion before relying on that.

18 likes 11mo
M
MSaarinenTL3Regular25 Aug 2025#63
w.moreau, post #30: Triple agonism: is the effect additive, synergistic, or neither? A phase 2 comparison of tirzepatide (dual) to retatrutide (triple) would answer that question. The published data does not include such a direct comparison. Go to post

Taking post #62 at face value and following it one step further.

TRIUMPH is phase 3 and it is ongoing. No phase 3 results exist. Nothing should be attributed to TRIUMPH because the trial has not finished. When it does, this page will update.

0 likes in reply to #30 11mo
IR
i.rasmussenTL226 Aug 2025#64

Retatrutide is investigational. Anything obtained outside a trial is by definition research-use-only material with no human-use authorisation. This site will state that plainly rather than winking at it.

1 like 11mo
SP
s.poulsenTL3Regular26 Aug 2025#65

Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from the dual agonists at equipotent effect, because equipotence has not been established either.

A guess, clearly labelled as one.

4 likes 11mo
EK
e.krastevTL227 Aug 2025#66
EM
e.mikkelsenTL2Member28 Aug 2025#67
h.nicolaides, post #25: Building on post #22 rather than restating it. No phase 3 results exist for retatrutide. Anything attributed to a completed phase 3 trial of this compound is either a misreading or an invention, and the honest answer to most questions here is that the data is not in yet. If that is already documented somewhere, ignore me and link it. Go to post

Building on post #65 rather than restating it.

Retatrutide is investigational. Material obtained outside a clinical trial is research-use-only by definition, is not approved for human use, and carries no assurance about its identity or content beyond whatever independent testing you commission yourself.

Adding it in case it saves somebody the afternoon it cost me.

0 likes in reply to #25 11mo
ET
e.tammTL228 Aug 2025#68

No notes. Posting so the count is not one.

0 likes 11mo
LD
l.dziedzicTL229 Aug 2025#69

The arithmetic in post #67 is right; the assumption feeding it is the part to check.

Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from the dual agonists at equipotent effect, because equipotence has not been established either.

2 likes 11mo
NL
n.lehtinenTL230 Aug 2025#70
p.onwuka, post #26: Post #24 put the caveat in the right place and I want to underline it. Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is why this subcategory is written more cautiously than the others. The strength of my opinion here… Go to post

Answering the question post #69 raises rather than the one it answers.

Why this subcategory is more cautious than elsewhere: retatrutide is investigational, phase 3 is ongoing, and the heart-rate signal in phase 2 is not negligible. Caution is proportionate to the evidence status.

8 likes in reply to #26 11mo
EI
e.iyerTL230 Aug 2025#71

Everything in post #67 holds. The case it does not cover is the one I have.

Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is why this subcategory is written more cautiously than the others.

Two sources, same conclusion, and I could not rule out that one copied the other.

4 likes 11mo
MH
ms_hollowayTL4Mass spectrometrist31 Aug 2025#72

Anyone deciding on the basis of what is published should know that what is published is a phase 2 programme and some pharmacokinetics. That is a genuinely early evidence base and this page will say so until it changes.

That is all I can say without guessing.

0 likes 11mo
SG
s.grimaldiTL21 Sep 2025#73
s.vanhecke, post #18: TRIUMPH is phase 3 and it is ongoing. No phase 3 results exist. Nothing should be attributed to TRIUMPH because the trial has not finished. When it does, this page will update. Go to post

Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is why this subcategory is written more cautiously than the others.

25 likes in reply to #18 11mo
DV
dr.villanuevaTL3Physician1 Sep 2025#74

Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from the dual agonists at equipotent effect, because equipotence has not been established either.

12 likes 11mo
RB
r.bruunTL22 Sep 2025#75

Mass and identity: a report on retatrutide should state the mass detected by LC-MS, not assume a theoretical mass. The theoretical mass is not published in peer-reviewed literature for retatrutide at present.

I am confident about the direction and much less about the magnitude.

7 likes 11mo
SC
sourced_claimsTL3Regular3 Sep 2025 · edited#76

Sensible. I would want the same detail before I acted on it either.

1 like 11mo
MR
m.radichTL23 Sep 2025#77
endpoint_line, post #27: Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from the dual agonists at equipotent effect, because equipotence has not been established either. Go to post

Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is why this subcategory is written more cautiously than the others.

33 likes in reply to #27 11mo
HO
h.oyelowoTL2Regular4 Sep 2025#78
m.ivaturi, post #11: Retatrutide is investigational. Material obtained outside a clinical trial is research-use-only by definition, is not approved for human use, and carries no assurance about its identity or content beyond whatever independent testing you commission yourself. Go to post

Building on post #75 rather than restating it.

Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from the dual agonists at equipotent effect, because equipotence has not been established either.

It is a small point and it changes the answer, which is an awkward combination.

17 likes in reply to #11 11mo
HM
h.mbekiTL25 Sep 2025#79

What we do not know about retatrutide, listed explicitly: long-term safety, real-world response rates, the dose response in diverse populations, whether the heart-rate signal persists or attenuates, durability of effect on withdrawal, efficacy in comorbidities beyond obesity.

0 likes 11mo
AL
a.lindholmTL25 Sep 2025#80

Adding the measurement that post #79 says would settle it.

Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from the dual agonists at equipotent effect, because equipotence has not been established either.

0 likes 11mo
AW
am.wikstromTL26 Sep 2025#81

Picking up post #80: that is the part I would want checked first.

Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is why this subcategory is written more cautiously than the others.

That is what I would do. It may not be what is correct.

2 likes 11mo
DM
d.magalhesTL2Member7 Sep 2025#82

On post #78 — agreed on the reasoning, with one qualification.

Nausea and vomiting were dose-related in the phase 2 work, as they are throughout this class. What is not established is whether the tolerability profile differs from the dual agonists at equipotent effect, because equipotence has not been established either.

Same conclusion as the reply above, reached differently, which is mildly reassuring.

9 likes 11mo
AC
a.coelhoTL27 Sep 2025#83
am.wikstrom, post #81: Picking up post #80: that is the part I would want checked first. Heart rate increased in a dose-dependent way in the phase 2 work. That is not a footnote — it is one of the specific things phase 3 exists to characterise, and it is why this subcategory is written more cautiously than the others. That is what I would do. It may not be… Go to post

No phase 3 results exist for retatrutide. Anything attributed to a completed phase 3 trial of this compound is either a misreading or an invention, and the honest answer to most questions here is that the data is not in yet.

21 likes in reply to #81 11mo
CW
cohort_watchTL2Member8 Sep 2025#84

A theoretical mass for retatrutide is not published in the peer-reviewed literature in a form worth quoting. A report should state the mass observed on the instrument rather than assert agreement with a figure nobody can check.

Take the reasoning and check the arithmetic; I do not always get it right.

0 likes 11mo

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