REGULATORYRFK Jr.: 14 peptides returning to Category 1 — FDA advisory committee July 2026UPDATESemaglutide and tirzepatide compounding ended — shortage resolved Feb/May 2025REGULATORYBPC-157, TB-500, thymosin alpha-1, CJC-1295, ipamorelin: expected Category 1 reclassification pendingFDAFDA advisory committee meetings scheduled: late July 2026RESEARCHA Phase 2 Study of Vosoritide in Children With Idiopathic Short Stature [NCT06382155]RESEARCHMetabolic Effects of Angiotensin-(1-7) [NCT02646475]RESEARCHEvaluation of Tirzepatide as an Adjunct to Buprenorphine for the Treatment of Opioid Use Disorder [NCT06651177]RESEARCHMulti-Site Trial of Tirzepatide for Smoking Cessation [NCT07602699]RESEARCHA Study of LY3457263 Compared With Placebo in Participants With Type 2 Diabetes on a Stable Dose of Semaglutide or Tirzepatide [NCT06897475]RESEARCHTranslational Health Research Into Vascular and Neurocognitive Effects of Weight Loss [NCT07592546]RESEARCHTirzepatide in the Treatment of Endometrial Cancer [NCT07605247]RESEARCHA Study of Tirzepatide (LY3298176) in Participants With Type 2 Diabetes During Ramadan [NCT06635057]RESEARCHA Master Protocol of Multiple Agents in Adults With Metabolic Dysfunction-Associated Steatotic Liver Disease (SYNERGY-Outcomes) [NCT07165028]NEWSOorja, run by Acceleron veterans, launches to make new fibrosis drugsREGULATORYRFK Jr.: 14 peptides returning to Category 1 — FDA advisory committee July 2026UPDATESemaglutide and tirzepatide compounding ended — shortage resolved Feb/May 2025REGULATORYBPC-157, TB-500, thymosin alpha-1, CJC-1295, ipamorelin: expected Category 1 reclassification pendingFDAFDA advisory committee meetings scheduled: late July 2026RESEARCHA Phase 2 Study of Vosoritide in Children With Idiopathic Short Stature [NCT06382155]RESEARCHMetabolic Effects of Angiotensin-(1-7) [NCT02646475]RESEARCHEvaluation of Tirzepatide as an Adjunct to Buprenorphine for the Treatment of Opioid Use Disorder [NCT06651177]RESEARCHMulti-Site Trial of Tirzepatide for Smoking Cessation [NCT07602699]RESEARCHA Study of LY3457263 Compared With Placebo in Participants With Type 2 Diabetes on a Stable Dose of Semaglutide or Tirzepatide [NCT06897475]RESEARCHTranslational Health Research Into Vascular and Neurocognitive Effects of Weight Loss [NCT07592546]RESEARCHTirzepatide in the Treatment of Endometrial Cancer [NCT07605247]RESEARCHA Study of Tirzepatide (LY3298176) in Participants With Type 2 Diabetes During Ramadan [NCT06635057]RESEARCHA Master Protocol of Multiple Agents in Adults With Metabolic Dysfunction-Associated Steatotic Liver Disease (SYNERGY-Outcomes) [NCT07165028]NEWSOorja, run by Acceleron veterans, launches to make new fibrosis drugs

For research purposes only. Full disclaimer →

Stack Library

Retatrutide Stack

Fat Lossadvanced

87

synergy

87
Share
Peptides

2

Avg Daily mcg

3,714

Level

advanced

Added

May 17, 2026

Overview

The Retatrutide Stack is the most aggressive fat loss protocol in the peptide community, combining the triple-agonist GLP-1/GIP/glucagon receptor action of Retatrutide with Tesamorelin''s specific visceral fat reduction and GH-axis support. Retatrutide is a next-generation incretin-based peptide that activates three distinct metabolic receptors simultaneously: GLP-1 (appetite suppression and glucose regulation), GIP (enhanced fat metabolism and insulin sensitivity), and glucagon (direct fat mobilization and energy expenditure increase). Phase 2 clinical trials showed Retatrutide produced up to 24% total body weight reduction — the most powerful weight loss signal observed in any pharmaceutical compound to date. It remains investigational (not FDA-approved) at time of writing. Tesamorelin is the only FDA-approved growth hormone secretagogue, originally approved for HIV-related lipodystrophy (excess visceral fat). It is a GHRH analog that specifically targets visceral adipose tissue — the metabolically dangerous abdominal fat. By stimulating GH release, Tesamorelin drives lipolysis specifically in visceral fat depots while preserving lean muscle mass. This makes it an ideal complement to Retatrutide''s systemic fat mobilization. The combination targets fat loss through three independent mechanisms: appetite and glucose regulation (Retatrutide''s GLP-1 action), enhanced fat metabolism (Retatrutide''s GIP action), direct energy expenditure increase (Retatrutide''s glucagon action), and GH-driven visceral lipolysis (Tesamorelin). Together, the stack addresses both the appetite and metabolic sides of obesity while specifically targeting visceral fat — the most dangerous and most resistant-to-diet depot. Requires close medical supervision due to the potency of both compounds.

Dosing Protocol

Retatrutide

Once per week· subcutaneous

Read more about Retatrutide →

12,000 mcg

per dose

Tesamorelin

Every day· subcutaneous

Read more about Tesamorelin →

2,000 mcg

per dose

Goals & Evidence

Aggressive fat lossVisceral fat reductionMetabolic optimizationBody recomposition
Evidence tier:Human Data

Warnings

  • Retatrutide is investigational — not FDA-approved. GI side effects can be severe during dose escalation. Medical supervision required. Not appropriate for patients with pancreatitis history or thyroid C-cell tumors.

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Disclaimer: This stack is community-submitted and for research purposes only. Peptide Contacts does not verify the safety or efficacy of submitted stacks. Always consult a qualified healthcare professional before using any peptide protocol.