ComparisonUpdated Mar 2026
Retatrutide vs Tirzepatide: Which is Better for Weight Loss?
Two of the most powerful weight loss peptides compared head-to-head. Here's how to choose.
Quick Comparison
| Factor | Retatrutide | Tirzepatide |
|---|---|---|
| Receptors | 3 (GLP-1 + GIP + Glucagon) | 2 (GLP-1 + GIP) |
| Avg Weight Loss | 28.7% | 22.5% |
| FDA Status | Phase 3 trials | FDA approved (Mounjaro/Zepbound) |
| Dosing | Once weekly | Once weekly |
| Nausea Profile | Moderate | Similar |
| Availability | Peptara Labs | Pharmacies + Peptara Labs |
| Cost (Vietnam) | ~5,200,000 VND/month | ~4,500,000 VND/month |
Bottom line: Retatrutide produces more weight loss. Tirzepatide has more safety data and regulatory approval.
How They Work
Tirzepatide
Mounjaro / Zepbound — Dual Agonist
- GLP-1: Reduces appetite, slows gastric emptying
- GIP: Enhances insulin response, reduces GLP-1 nausea
- FDA approved (2022 diabetes, 2023 weight loss)
- Average weight loss: 22.5% over 72 weeks
Retatrutide
Triple Agonist — Phase 3 Trials
- GLP-1: Same appetite suppression as Tirzepatide
- GIP: Same insulin enhancement
- Glucagon: Directly increases metabolic rate + fat oxidation
- Average weight loss: 28.7% over 48 weeks
Weight Loss Results Compared
| Timeframe | Retatrutide | Tirzepatide |
|---|---|---|
| 12 weeks | ~10% | ~8% |
| 24 weeks | ~18% | ~15% |
| 48 weeks | ~28.7% | ~22.5% |
| 72 weeks | Data pending | ~25.3% |
The gap widens over time. Retatrutide's glucagon activation provides additional fat-burning that compounds with the appetite suppression.
Which Should You Choose?
Choose Retatrutide If:
- Maximum weight loss is your primary goal
- You're comfortable with a less-studied compound
- You can access a verified research supplier
- You want the "strongest available" option
- You've plateaued on other GLP-1s
Choose Tirzepatide If:
- You prefer an FDA-approved compound
- You want more long-term safety data
- You can access it through a pharmacy or clinic
- You're concerned about being on the cutting edge
- 22% weight loss is sufficient for your goals
Dosing Comparison
Tirzepatide Protocol
| Week | Dose |
|---|---|
| 1–4 | 2.5mg |
| 5–8 | 5mg |
| 9–12 | 7.5mg |
| 13–16 | 10mg |
| 17+ | 12.5–15mg |
Retatrutide Protocol
| Week | Dose |
|---|---|
| 1–4 | 2mg |
| 5–8 | 4mg |
| 9–12 | 8mg |
| 13+ | 8–12mg |
The Verdict
| Goal | Recommendation |
|---|---|
| Maximum weight loss | Retatrutide |
| Most safety data | Tirzepatide |
| FDA-approved option | Tirzepatide |
| Already plateaued on GLP-1 | Retatrutide |
| First-time GLP-1 user | Either (Tirzepatide slightly safer) |
| Budget-conscious | Tirzepatide (usually cheaper) |
Both are excellent options. The "best" choice depends on your risk tolerance, goals, and access.
Availability in Vietnam
Peptara Labs
peptaralabs.ioCOA-verified Retatrutide with cold-chain shipping across Vietnam.
Visit Peptara LabsRelated Guides
This guide is for educational purposes only. Consult a healthcare professional before starting any peptide protocol.