Lose Fat
Tirzepatide
Studied in Phase 3 trials for up to 22.5% body-weight reduction
The dual-agonist GLP-1 peptide. Activates both GLP-1 and GIP receptors for appetite suppression and enhanced fat metabolism. Studied in multiple Phase 3 trials.
Average weight loss
SURMOUNT-1 Phase 3 Trial
Flat $35 tracked shipping
20mg per vial
Email signup: $157 USD (save 15%)
60-Day Money Back Guarantee · Protocol dashboard · Tracked worldwide shipping
Worldwide Shipping
- 5 to 10 business days, guaranteed
- Flat $35 shipping to supported markets
- Pay by card, crypto, or Wise
- All sales final
Independently lab-tested
- Purity: 99.31% (HPLC)
- Identity: confirmed (LC-MS)
- Sterility: no growth
- Endotoxin: within limit
- Heavy metals + fentanyl: not detected
Plus an independent Janoshik bacterial endotoxin report.
View full certificate
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
Dual-Agonist Technology
Tirzepatide simultaneously activates two metabolic receptor pathways: GLP-1 and GIP. This dual mechanism creates synergistic effects that single-agonist peptides like Semaglutide cannot achieve.
GLP-1 Receptor
Appetite Suppression
Reduces hunger signals and increases satiety after meals. Slows gastric emptying for prolonged fullness.
GIP Receptor
Fat Metabolism
Enhances insulin sensitivity and promotes fat breakdown. Improves glucose control and metabolic health.
Clinical Data
Clinical Trial Results
22.5%
Average Weight Loss
72 weeks
89%
Achieved 5%+ Loss
of participants
2,539
Trial Participants
SURMOUNT-1
Data from SURMOUNT-1 Phase 3 clinical trial, published in The New England Journal of Medicine. Results represent participants receiving the 15mg maintenance dose. Individual results may vary.
A Well-Studied Compound
The brand drug tirzepatide is FDA-approved as Mounjaro (for Type 2 diabetes) and Zepbound (for weight management); research-grade tirzepatide, including ours, is not an FDA-approved product. The compound has been studied in clinical trials with over 20,000 participants, with reported side effects documented across those trials.
Free Tool
Tirzepatide Weight Loss Calculator
A body-composition estimator that models the SURMOUNT trial trajectory (Jastreboff, NEJM 2022) against your inputs, so you can see what published research describes.
Educational estimate based on published research, not a prescription and not a personal dose. This tool reports what trials studied. A licensed clinician sets any dose.
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
Weeks 1-4
In trials, the schedule begins at 2.5mg weekly as a tolerance-building dose. Participants reported only mild appetite reduction. Educational reference; consult a licensed physician.
Weeks 4-8
Trials titrated to 5mg. Appetite suppression became clearer and early fat loss of 2-4% body weight was reported.
Weeks 8-20
Trials stepped up toward 10-15mg as tolerated. Fat loss accelerated through the SURMOUNT dose range.
Weeks 20+
Maintenance at the studied effective dose. Sustained loss with improved glucose and metabolic markers was reported.
Your Kit
What's Included
Tirzepatide 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 Protocol Support
Direct team access
What's included with your Tirzepatide 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.
$185 USD
Flat $35 shipping · All sales final
Our Guarantee
We Stand Behind Our Quality.
Peptara Labs supplies research-grade Tirzepatide. The brand drugs Mounjaro and Zepbound are FDA-approved; research-grade tirzepatide, including ours, is not an FDA-approved product. We stand behind our product quality, verified by a certificate of analysis on every batch.
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.
Research and citations
Peer-reviewed sources
- Jastreboff AM, et al. (2022). Tirzepatide Once Weekly for the Treatment of Obesity (SURMOUNT-1). New England Journal of Medicine. doi.org/10.1056/NEJMoa2206038
- Aronne LJ, et al. (2024). Continued Treatment With Tirzepatide for Maintenance of Weight Reduction in Adults With Obesity (SURMOUNT-4). JAMA. doi.org/10.1001/jama.2023.24945
Peptara Labs supports an evidence-based protocol. Citations refer to peer-reviewed publications used to inform our dosing guidance and customer protocols. Not a substitute for medical advice.
Explore more
Related guides, comparisons, and stack-pair compounds
Tirzepatide price per vial
Full cost breakdown per vial and per mg, plus email-signup pricing.
Tirzepatide complete guide
Dual-agonist mechanism, SURMOUNT data, titration in units, and stacking.
Tirzepatide vs Retatrutide
Dual-agonist (brand drug FDA-approved) vs triple-agonist maximum studied effect.
Tirzepatide vs Ozempic
22% vs 15% fat loss, and the cost difference.
Best peptides for fat loss
How Tirzepatide ranks by trial effect size.
Reconstitution calculator
Work out your exact units per dose, never in mL.
BPC-157
Stack pair for joint and gut support during a cut.
Tirzepatide dosage
What the SURMOUNT trials used, in units not mL.
Tirzepatide side effects
Reported effects and how often they occurred.
Tirzepatide results timeline
What the trials measured week by week.
Tirzepatide half-life
Why it is a once-weekly compound.
Tirzepatide for weight loss
The SURMOUNT-1 fat-loss data in plain terms.
Tirzepatide FAQ
Ready to Start Losing Fat?
Order Tirzepatide today. Worldwide shipping, 5 to 10 business days, guaranteed.
Order Now · $185 USDCertificate of analysis included · Ongoing protocol support · Tracked worldwide shipping