Lose Fat
Retatrutide
Studied in Phase 3 trials for up to 28.7% body-weight reduction
Average weight loss
TRIUMPH-4 Phase 3 Trial
Flat $35 tracked shipping20mg per vial
| Test | Result | Verdict |
|---|---|---|
| Purity, HPLC | 99.18% | PASS |
| Identity, LC-MS | 4731.4 Da | PASS |
| Sterility | No growth | PASS |
| Endotoxin | 4.070 EU/Vial | PASS |
| Heavy metals + fentanyl | Not detected | PASS |
Shipping, delivery and guarantee terms
- Shipping
- Flat $35, tracked worldwide to supported markets
- Delivery
- 5 to 10 business days, guaranteed
- Payment
- Card, crypto, or Wise · All sales final
- Included
- 60-day money-back guarantee · Protocol dashboard
Switching or stalled
Plateaued on Ozempic, Wegovy, or Mounjaro?
A lot of people find their way here after a first-generation GLP-1 stops doing what it did at the start: the early response tapers, the scale stalls, appetite creeps back. Retatrutide is a newer, triple-receptor molecule, and the honest way to weigh the difference is side by side, not from a sales page. Two research-based comparisons:
Retatrutide vs Ozempic
How the two compare, by mechanism and trial data.
Retatrutide vs Tirzepatide
Where the newer triple-agonist differs from the dual.
Ozempic, Wegovy, and Mounjaro are FDA-approved medications. Research-grade peptides, including ours, are not FDA-approved and are sold for research purposes only. This is education, not medical advice or a treatment claim.
The Science
Triple-Agonist Technology
Retatrutide simultaneously activates three metabolic receptor pathways: GLP-1, GIP, and glucagon. This creates compounding effects that single or dual-agonist peptides cannot match.
GLP-1 Receptor
Appetite Suppression
Reduces hunger signals and increases satiety after meals.
GIP Receptor
Fat Metabolism
Enhances insulin response and promotes fat breakdown.
Glucagon Receptor
Energy Expenditure
Increases thermogenesis and caloric burn at rest.
Clinical Data
Clinical Trial Results
28.7%
Average Weight Loss
68 weeks
58.6%
Achieved 25%+ Loss
of participants
445
Trial Participants
Phase 3
Data from the Phase 3 TRIUMPH-4 trial of retatrutide, reported by Eli Lilly (topline, 2025). Results represent participants receiving the 12mg maintenance dose over 68 weeks; detailed results are pending peer-reviewed publication. Individual results may vary.
Protocol Timeline
See what to expect, week by week
Protocol Timeline
See what to expect, week by week
Your protocol timeline
What to expect, week by week
Week 1
In trials, the schedule begins at 0.5mg weekly. Most participants reported no side effects at this dose. Educational reference; consult a licensed physician.
Weeks 2-3
Appetite decreased noticeably in trials. Early weight loss of 1-2kg was commonly reported.
Weeks 4-6
Trials titrated to 2mg. Fat loss accelerated; 3-5% total body-weight reduction was commonly reported.
Weeks 8-12
Studied maintenance range of 4-12mg. Sustained fat loss with improved metabolic markers was reported.
Calculator
Calculate your projected weight loss
Calculator
Calculate your projected weight loss
Free Tool
Retatrutide Weight Loss Calculator
A body-composition estimator that models the Phase 2 trial trajectory (Jastreboff, NEJM 2023) against your inputs, so you can see what published research describes, not marketing math.
Educational estimate based on published research, not a prescription and not a personal dose. This tool reports what trials studied and models trajectories at studied doses. A licensed clinician sets any dose.
Your Kit
What's Included
Retatrutide 20mg Vial
20mg per vial · Pre-measured weekly doses
What ships with your order
Your kit includes the vials and bacteriostatic water. Insulin syringes ship with your order to select delivery regions; where they can't ship, we send a same-day sourcing link and walk you through your first draw. We confirm exactly what is included with your order.
Research Reference (educational)
Ranges and titration schedules reported in published studies. Not a prescription; consult a licensed physician.
Worldwide Shipping
5 to 10 business days, guaranteed
Ongoing Support
Direct team access
What's included with your Retatrutide order
Your kit includes the vials and bacteriostatic water. Insulin syringes ship with your order to select delivery regions; where they can't ship, we send a same-day sourcing link and walk you through your first draw. We confirm exactly what is included with your order.
Traveling with your order
Freeze-dried vials are stable at room temperature, so powder travels well in your bag. Once a vial is mixed it needs to stay cold, so keep reconstituted vials with an ice pack and refrigerate on arrival. Rules vary by country and are the traveler’s responsibility to check. Have a trip coming up? Share your dates when you order so delivery lands before you leave.
Why your vials arrive plain
Your vials ship unlabeled on purpose. Plain packaging keeps your order discreet, and it is standard for research-grade material, not a sign that anything is off. To match your batch to its third-party certificate, send the team your order number. See the certificates on our COA page.
$205 USD
Flat $35 shipping · All sales final
From our customer protocols
What Peptara Retatrutide customers actually do
Observed patterns from real Peptara Labs customer protocols, anonymized. Our team has served 100+ customers across peptide protocols. Updated 2026-05-25.
2mg weekly titrating to 4mg by week 8
Most common dosing
Appetite suppression week 1-2, scale movement week 3-4
First-effects timeline (customer-reported)
Retatrutide + BPC-157 (joint protection during cut)
Most common stack pairing
Our Guarantee
We Stand Behind Our Quality.
Peptara Labs supplies research-grade Retatrutide, third-party tested with a certificate of analysis on every batch. We stand behind our product quality. We cannot promise a specific health result, that depends on you, but we guarantee what we ship.
60-Day Money Back Guarantee
Test it at any lab, or your money back
Send any vial to an independent lab within 60 days of delivery. If it does not test as stated on its certificate of analysis (COA), or your order was not handled correctly, you get a full refund. The 60 days is your window to verify us, not a shelf life. The guarantee is on product quality, never on a health outcome.
Educational Protocol Reference, Included
Bodies respond differently. Every order includes a research dosing reference drawn from published studies, plus ongoing educational support at no extra cost. This is not a prescription; consult a licensed physician.
Direct WhatsApp Access
Every order includes direct access to our support team. Questions about reconstitution, handling, or your order, message us any time and a real person responds.
100+
Customers served
Consistently rated by our customers
6 mo.
Purity guarantee
Quality guarantee: full refund on any purity failure. All sales otherwise final. The 60-day money back guarantee covers product purity, certificate of analysis, and fulfillment, not a health outcome. Individual results vary. This is educational information, not medical advice; consult a licensed physician before use.
Retatrutide FAQ
Ready to Start Losing Fat?
Order Retatrutide today. Worldwide shipping, 5 to 10 business days, guaranteed.
Order Now · $205 USDCertificate of analysis included · Ongoing protocol support · Tracked worldwide shipping
Keep reading
Retatrutide research guides
Retatrutide price per vial
Full cost breakdown per vial and per mg, plus email-signup pricing.
Retatrutide dosage
What the phase 2 trial arms used, in units not mL.
Retatrutide side effects
Reported effects and how often they occurred.
Retatrutide results timeline
What the trial measured week by week.
Retatrutide half-life
Why it is dosed once weekly.
Retatrutide for weight loss
The 24 percent fat-loss phase 2 data in plain terms.
Retatrutide before and after
What the trial results looked like over time.