Retatrutide
Lilly's next-generation triple agonist: GIP, GLP-1 and glucagon in one molecule.
Retatrutide · vial · 10 mg
Ready to draw: we mix it with bacteriostatic water for you.
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Retatrutide is a triple GIP, GLP-1 and glucagon receptor agonist, the next step after dual agonists like tirzepatide. In the Phase 3 TRIUMPH-4 trial, participants on the highest dose lost 28.7% of their body weight on average over 68 weeks. Available in 10 mg and 30 mg, as a vial or a pre-filled pen.
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Overview
Retatrutide (LY3437943) is an investigational once-weekly molecule developed by Eli Lilly. It adds a third target to the GIP and GLP-1 pair: the glucagon receptor, which is linked to energy expenditure and fat metabolism in the liver. Three pathways in one molecule is what sets it apart from every approved incretin drug.In the Phase 2 trial published in the New England Journal of Medicine (2023), 338 adults with obesity took part for 48 weeks. Participants on the 12 mg dose lost 24.2% of their body weight on average, against 2.1% on placebo. The Phase 3 TRIUMPH programme went further: according to Lilly, 28.7% at 68 weeks in TRIUMPH-4 and 28.3% at 80 weeks in TRIUMPH-1.Retatrutide is still in late-stage trials, which makes it one of the most closely watched molecules in metabolic research. PeptiLab supplies it in 10 mg and 30 mg, as a vial (reconstituted or dry, your choice) or a disposable pre-filled pen.
- Three pathways, one molecule: GIP, GLP-1 and glucagon receptors
- 24.2% average weight loss at 48 weeks in the Phase 2 NEJM trial
- Up to 28.7% at 68 weeks in the Phase 3 TRIUMPH-4 trial
- Developed by Eli Lilly, the company behind tirzepatide
- 10 mg or 30 mg, as a vial or a ready-to-use pen
Reviewed by PeptiLab editorial team · 25 September 2026
What users report
- Up to 24% body weight loss at the top dose in the Phase 2 trial (NEJM, 2023)
- Stronger appetite control than tirzepatide or semaglutide, by many users' accounts
- More energy on cycle: the glucagon arm is the feature the community talks about most
- Visible changes in the face by weeks 3–4, a sharper jawline by weeks 6–8
- Less is more: 2–4 mg is often enough; higher doses add side effects rather than speed
- One injection a week
Collected from open discussions in the peptide community. Everyone's experience is their own.
What the research shows
- Triple action: one molecule activates the GIP, GLP-1 and glucagon pathways
- Published Phase 2 data: body weight and metabolic markers in a controlled trial (NEJM, 2023)
- Phase 3 TRIUMPH programme: up to 28.7% weight loss at 68 weeks, according to Lilly
- Metabolic markers: insulin sensitivity, blood lipids and liver fat in trial participants
Retatrutide activates the GIP, GLP-1 and glucagon receptors. The GIP and GLP-1 arms reduce appetite and improve the insulin response, while glucagon receptor activity is linked in studies to higher energy expenditure and lower liver fat.
Protocol
Compiled from published research and the experience of the peptide community. Timings are calculated for one PeptiLab vial or pen of this dose.
- Dose
- 2 mg; the community most often stays within 2–4 mg
- Route
- Subcutaneous injection
- Frequency
- Once a week
- Best time
- Any time, on the same day each week
- One vial lasts
- 10 mg vial: about 5 weeks at 2 mg. 30 mg vial: about 15 weeks
- Cycle
- As needed
Doses in published studies
Doses and study durations from published research. Every row links to its original source.
- Clinical studyPhase 2 randomised, double-blind, placebo-controlled trial
- Dose studied
- 1 mg, 4 mg, 8 mg or 12 mg once weekly
- Route
- Subcutaneous
- Duration
- 48 weeks
- Study size
- 338 participants
Jastreboff AM et al. N Engl J Med. 2023;389(6):514-526 · PMID 37366315
Sources checked by 21 September 2026
How to store
Store refrigerated at 2–8°C, away from light.
Shipping & payment
Free delivery across Bali on orders from Rp 3.000.000, and on every stack. Below that, delivery is Rp 100.000. Same-day delivery across Bali; the manager confirms the exact time. Payment is made after a manager contacts you and confirms the order; no payment is taken on this site.
Free delivery across Bali on orders from Rp 3.000.000, and on every stack. Below that, delivery is Rp 100.000. Same-day delivery across Bali; the manager confirms the exact time. Payment is made after a manager contacts you and confirms the order; no payment is taken on this site.
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- Other Bali area (confirm on WhatsApp)
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