Last reviewed: May 2026 · By Noki Labs Team
Educational content only. Always consult a licensed healthcare provider before starting any peptide or wellness protocol.
TL;DR
Tirzepatide is a dual GIP/GLP-1 receptor agonist with the strongest published Phase-3 weight-loss evidence to date (~22.5% in SURMOUNT-1 at 72 weeks). Retatrutide is a triple GIP/GLP-1/glucagon agonist that delivered ~24.2% at 48 weeks in Phase-2 — still investigational, but the steepest curve seen in any GLP-1-class trial. For most Filipino customers, Tirzepatide is the more validated, more affordable, easier-to-source option in 2026.
The two molecules at a glance
Tirzepatide and Retatrutide both belong to the incretin mimetic family — peptides that mimic gut hormones to regulate appetite, gastric emptying, and insulin response. The difference is which receptors they hit.
Tirzepatide (dual agonist)
Activates GLP-1 and GIP receptors. GIP appears to potentiate GLP-1's appetite-suppressing and glycemic effects while reducing nausea relative to pure GLP-1 agonists. Tirzepatide has multi-year cardiovascular safety data and a maturing real-world evidence base.
Retatrutide (triple agonist)
Adds glucagon receptor activation to the GLP-1/GIP combination. Glucagon agonism increases energy expenditure and lipolysis — meaning the body burns more, on top of eating less. Phase-3 trials (TRIUMPH program) are still reading out as of 2026.
Head-to-head: trial outcomes
Two of the most-cited trials in the GLP-1 space:
- SURMOUNT-1 (Tirzepatide): 72-week, N=2,539 adults with obesity, no diabetes. Mean weight loss at 15mg dose: 22.5% (placebo: 2.4%). Published in NEJM, 2022. PubMed: 35658024
- Retatrutide Phase-2: 48-week, N=338 adults with obesity. Mean weight loss at 12mg dose: 24.2%. Published in NEJM, 2023. PubMed: 37366315
Important caveat: these are different trials, with different durations, populations, and titration schedules. The 24.2% Retatrutide number is at 48 weeks — extrapolated curves suggest it may exceed 30% at 72 weeks, but that data isn't published yet.
Side effect profiles
Both molecules share the typical incretin GI side-effect profile: nausea, diarrhea, constipation, occasional vomiting — almost always early in titration and mostly resolving by week 8–12. See our deeper write-up on Tirzepatide side effects for management strategies.
Retatrutide adds a watchpoint: glucagon agonism can transiently raise resting heart rate (~3–7 bpm in trials) and may increase fasting glucose at higher doses. The mechanism is well understood but the long-term implications are still being studied.
Dosing and titration
Both peptides follow a slow up-titration to limit GI side effects.
- Tirzepatide: typically 2.5mg/week → 5 → 7.5 → 10 → 12.5 → 15mg, stepping every 4 weeks. See our full Tirzepatide dosage guide.
- Retatrutide: trial schedules used 2mg/week → 4 → 8 → 12mg, stepping every 4 weeks. Some reference protocols stop at 8mg if appetite suppression is sufficient.
Cost in the Philippines (May 2026)
Real-world reference pricing at Noki Labs:
- Tirzepatide: ₱2,000–3,500 per vial across 4 variants (5mg / 10mg / 15mg / 30mg)
- Retatrutide: ₱2,500–3,200 per vial across 2 variants
For a 12-week reference cycle at moderate dose, expected outlay is ₱8k–14k for either peptide. Use code WELCOME10 for 10% off your first order, BULK20 for 20% off ₱15k+ stacks.
Which one fits which wellness goal?
| Goal | Better fit |
|---|---|
| Maximum published evidence base | Tirzepatide |
| Highest reported magnitude of fat loss | Retatrutide |
| Easier titration / fewer GI symptoms | Tirzepatide |
| Body-recomp / preserving lean mass | Retatrutide (glucagon-driven energy expenditure) |
| Long-term cardiovascular reassurance | Tirzepatide |
| Lower budget | Tirzepatide (5mg variant) |
Stacking: the cagrilintide question
A 2024–2025 trend is stacking Cagrilintide (a long-acting amylin analog) with Tirzepatide for additive appetite suppression and glycemic control. We cover the protocol, dosing, and timing in The Cagrilintide + Tirzepatide Stack: 2026 Protocol.
How this applies in the Philippines
FDA-PH classifies Tirzepatide-containing therapeutics as prescription-only when sold for human use. Premium peptides for personal wellness use operate in a different regulatory lane. See our explainer: Are peptides legal in the Philippines?.
Practical realities for Filipino customers:
- COD available nationwide via J&T and LBC. Metro Manila next-day; provincial 2–4 days.
- Cold-chain handling matters — peptides ship in insulated boxes with ice packs. Reconstitute within 24 hours of arrival, store at 2–8°C. See cold-chain handling.
- Pillar resource: Tirzepatide Philippines, our deep-dive hub.
- Comparison hub: Tirzepatide vs Retatrutide pillar page with current trial data.
- Metro Manila buyers: see our Manila peptide supplier guide.
- Browse all weight-management peptides: /collections/weight-management.
FAQ
Is Retatrutide stronger than Tirzepatide?
In Phase-2 head-to-head-style data, Retatrutide produces a steeper weight-loss curve. But Phase-3 evidence on Tirzepatide is far more mature, and individual response varies.
Can I switch from Tirzepatide to Retatrutide mid-cycle?
Customers typically complete the current titration block, taper down for 2 weeks, then start Retatrutide at the equivalent receptor-saturation dose (often 4mg). Always under medical supervision.
Which has more nausea?
Anecdotally, Retatrutide users at higher doses report slightly more nausea due to the glucagon effect. Tirzepatide is generally considered the gentler titration.
Are these legal to buy in the Philippines?
Premium peptides for personal wellness use are legally importable. Therapeutic prescription is restricted to FDA-PH-licensed clinicians. Full legal breakdown.
How do I know I'm getting authentic peptide?
Look for batch-specific COA (Certificate of Analysis), HPLC purity ≥98%, and proper cold-chain shipping. See how to spot fake peptides.
Where to buy lab-tested peptides in the Philippines
Noki Labs ships HPLC-verified Tirzepatide and Retatrutide with COA per batch. Browse the full weight-management collection or read our Manila supplier guide for delivery details.
Always consult a licensed healthcare provider before starting any new peptide or wellness regimen. Individual results vary. Statements about our products are educational and not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed: May 2026 · Read more in our FAQ