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   2024–2025 University Research Library

Research Protocols

Expert-curated peptide research stacks based on the latest 2024–2025 university studies. 53+ compounds across 12 research stacks — all dosing, cycling, and mechanism data in one place.

 For qualified researchers only. Not medical advice. Consult your medical provider.

Latest Clinical Data — 2026

Retatrutide TRIUMPH Program Results

Topline data from Eli Lilly’s Phase 3 TRIUMPH and TRANSCEND trials (2025–2026), comparing the triple-hormone agonist Retatrutide against approved GLP-1 and dual-agonist therapies.

Semaglutide

GLP-1 Agonist (Wegovy)

13.7%

Mean weight loss (SURMOUNT-5, 72 weeks)

Key Trial

TRIUMPH-4 — Knee Osteoarthritis

Topline reported Dec 2025. 68-week duration. Obese participants with knee OA showed 28.7% body weight reduction at the 12 mg dose.

Tirzepatide

GIP/GLP-1 Dual Agonist (Zepbound)

20.2%

Mean weight loss (SURMOUNT-5, 72 weeks)

Key Trial

TRANSCEND-T2D-1 — Type 2 Diabetes

Topline reported March 2026. 48-week duration. T2D cohort achieved 16.8% weight loss alongside improved glycemic control.

Retatrutide

Triple Agonist (GIP/GLP-1/GCG)

24.2–28.7%

Mean weight loss (SURMOUNT-5, 72 weeks)

Key Trial

Phase 2 — NEJM Published

48-week dose-escalation study. 24.2% mean weight loss at 12 mg. Continuous trajectory without plateau by week 48.

Comparative Research Insight

In the head-to-head SURMOUNT-5 trial, Tirzepatide delivered roughly 47% more relative weight loss than Semaglutide (20.2% vs. 13.7%). Retatrutide builds on this by adding glucagon receptor agonism — a mechanism that further amplifies energy expenditure and lipolysis. Early Phase 3 data suggests Retatrutide may exceed Tirzepatide by an additional 4–8 percentage points in total body weight reduction, with the TRIUMPH-4 readout reaching nearly double the fat loss percentage observed with Semaglutide.

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Research Use Only — Compliance & Legal Disclaimer

All protocols, stacks, and compound information on this page are strictly for scientific research and educational signaling purposes only. These materials are not intended to diagnose, treat, cure, or prevent any disease or medical condition. The compounds referenced are research chemicals and are not approved by the FDA or any regulatory authority for human consumption, therapeutic use, or veterinary use unless explicitly stated.
The information provided reflects published academic and university research literature as of 2024–2025. It is presented solely as a reference for licensed researchers, scientists, and qualified professionals operating within applicable legal frameworks.
This is not medical advice.
Accuracy Notice: Dosing ranges, cycling protocols, and research references cited herein are derived from publicly available peer-reviewed literature, pre-clinical studies, and early-phase human trials. Many compounds have not completed full Phase III human clinical trials. Dosing data may be extrapolated from animal models. Always verify references independently through PubMed, ClinicalTrials.gov, or your institution's research database before use in any study.
You must consult a licensed medical provider, physician, or qualified healthcare professional before considering any compound for personal use. By accessing these protocols, you confirm that you are a qualified researcher and that your use complies with all applicable local, state, federal, and international laws and regulations. Research Peptides Co. assumes no liability for misuse of this information.

Research Stack Library

12 Stacks • 53+ Compounds

Click any stack to expand and view all compounds, dosing schedules, routes of administration, and research references. All protocols are currently unlocked for review.

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Tissue Repair & Injury Recovery Stack

4 compounds in this stack
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Metabolic Optimization & Fat Loss Stack

6 compounds in this stack
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Cognitive Enhancement & Neuroprotection Stack

6 compounds in this stack
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Longevity & Anti-Aging Stack

6 compounds in this stack
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Growth Hormone Optimization Stack

5 compounds in this stack
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Immune Modulation & Anti-Inflammation Stack

5 compounds in this stack
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Sexual Health & Hormonal Research Stack

3 compounds in this stack
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Sleep, Recovery & Circadian Optimization Stack

4 compounds in this stack
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Skin, Hair & Dermal Regeneration Stack

4 compounds in this stack
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Gut Health & Gastrointestinal Research Stack

4 compounds in this stack
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Cardiovascular & Cardioprotection Stack

4 compounds in this stack
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Reconstitution & Laboratory Fundamentals

3 compounds in this stack
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