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FAT LOSSPhase IIIAMYLIN RECEPTOR AGONISTWEIGHT LOSSOBESITY

Eloralintide

Also known as: LY3841136 · LY-3841136

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Eloralintide is Eli Lilly's once-weekly, selective amylin receptor (AMY1R) agonist for obesity, engineered to avoid activity at the calcitonin receptor. Phase 2 data showed up to 20% mean placebo-adjusted weight loss at 48 weeks with predominantly mild GI side effects; Phase 3 (ENLIGHTEN-1) began enrolling in 2026.

STRUCTURE

Molecular Composition

FORMULA
C₂₀₁H₃₁₉N₄₉O₆₅S₂
MOL. WEIGHT
4,526.10 Da
SEQUENCE LENGTH
37 amino acids
CAS NUMBER
2883634-40-8
TARGET
AMY1R (amylin receptor)
ROUTE
Subcutaneous, once weekly
AMINO ACID CHAIN VISUALIZATION
K
Lys (acylation site)
di-γ-Glu-linked C20 fatty diacid anchor
NH-CO
C
Cys
methylene thioacetal bridge (Cys2–Cys7)
NH-CO
C
Cys
methylene thioacetal bridge partner
NH-CO
N
Asn
amylin receptor contact
NH-CO
T
Thr
AMY1R selectivity region
NH-CO
A
Ala
backbone stability
SEQUENCEK-C-C-N-T-A
MECHANISMS

How It Works

🎯
Selective AMY1R Agonism
Eloralintide is a fatty-acid-acylated analog of human amylin engineered for selective binding at the AMY1R complex (human AMY1R EC50 23.9 pM) over the related AMY3R and calcitonin receptors, reducing off-target activity relative to less selective amylin analogs.
🧠
Central Satiety Signalling
Acts centrally at the area postrema and hypothalamus to reduce food intake, slow gastric emptying, and suppress glucagon secretion — a satiety mechanism distinct from, and potentially additive to, GLP-1/GIP incretin agonism.
⏱️
Extended Half-Life via Fatty Acid Acylation
Lys26 acylation with a di-γ-Glu-linked C20 fatty diacid promotes albumin binding, extending the peptide's circulating half-life enough to support once-weekly subcutaneous dosing.
💪
Lean-Mass-Preserving Weight Loss
Phase 2 data showed substantial weight loss (up to 20% at the top dose) without the muscle-mass loss signal associated with some incretin therapies, positioning it as a potential complement to GLP-1/GIP drugs rather than a pure replacement.
OVERVIEW

Research Overview

In the Phase 2 trial, once-weekly subcutaneous eloralintide at 1, 3, 6, and 9 mg produced mean weight reductions of roughly 9%, 12%, 18%, and 20% respectively at 48 weeks, versus 0.4% with placebo — with nausea and fatigue as the dominant adverse events and no signal of the muscle-mass loss associated with some incretin therapies. It is being studied both as monotherapy and as a complementary add-on to incretin (GLP-1/GIP) therapy.

Phase 3 (ENLIGHTEN-1) started in 2026 and is expected to run through at least 2028. Not yet FDA-approved.

Mechanism of Action

// SELECTIVE AMY1R AGONISM

Eloralintide is a fatty-acid-acylated analog of human amylin, engineered for selective binding at the AMY1R complex (human AMY1R EC50 23.9 pM) over the related AMY3R and calcitonin receptors.

// CENTRAL SATIETY PATHWAY

Amylin receptor agonism acts centrally at the area postrema and hypothalamus to reduce food intake, slow gastric emptying, and suppress glucagon secretion — a satiety mechanism distinct from, and potentially additive to, GLP-1/GIP incretin agonism.

DOSAGE

Dosage & Administration

INJECTABLE (SUBCUTANEOUS) — PHASE 2 TRIAL RANGE
DOSE
1 mg → 3 mg → 6 mg → 9 mg
FREQUENCY
Once weekly; dose-escalated over 48 weeks
NOTES
Phase 2 protocol. The 9 mg arm produced the largest effect (~20% mean placebo-adjusted weight loss at week 48). Nausea and fatigue were the dominant adverse events. Not yet FDA-approved — Phase 3 (ENLIGHTEN-1) dosing may differ.

Eloralintide is being developed both as monotherapy and as a complementary add-on to incretin (GLP-1/GIP) therapy. It is investigational only — not commercially available, and no consumer-grade sourcing should be considered safe or authentic.

CYCLING

Cycle Duration Guide

ON CYCLE
Continuous weekly dosing during trial protocols (chronic weight-management model, not a short cycle)
OFF CYCLE
Not established — no approved discontinuation protocol exists yet

As an amylin-pathway agonist still in Phase 3 trials, no real-world cycling data exists outside controlled studies.

Investigational — not yet FDA-approved. Long-term safety beyond the current trial duration (through 2028) is not yet established.

NOTES

Research Notes

Investigational, Phase 3 (ENLIGHTEN-1, ongoing). Structure includes a Cys2–Cys7 methylene thioacetal bridge and 3 non-coded residues, so its sequence is not representable in standard one-letter amino-acid code. Not yet FDA-approved.

Quick Reference
FORMULAC₂₀₁H₃₁₉N₄₉O₆₅S₂
MOL. WEIGHT4,526.1 Da
LENGTH37 amino acids
ORIGINSynthetic amylin analog (Eli Lilly and Company)
HALF-LIFESupports once-weekly subcutaneous dosing
SOLUBILITYNot publicly disclosed
CAS NO.2883634-40-8
STATUSPhase III
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TAGS
amylin receptor agonistweight lossobesityonce-weeklyAMY1R selective