Peptide therapy · Weight loss
Peptides for weight loss: what works, what doesn't, and what's legal
Weight-loss peptides split into two categories: the GLP-1 family that works dramatically well, and a long tail of 'fat-loss peptides' with modest or unproven effects. Here's the honest breakdown.
Tier 1: proven, prescribable
- Tirzepatide — dual GIP/GLP-1, ~18-22% weight loss
- Semaglutide — GLP-1, ~12-15% weight loss
- Liraglutide — daily GLP-1, older, ~5-8%
Tier 2: adjuncts, not primary tools
- CJC-1295 / Ipamorelin — GH release, better body composition, minimal scale change
- Tesamorelin — FDA-approved for HIV lipodystrophy, reduces visceral fat
- MOTS-c — mitochondrial peptide, early metabolic data
Tier 3: weak or unproven
- AOD-9604 — did not beat placebo in RCT
- HGH fragment 176-191 — no controlled human weight-loss data
- 5-Amino-1MQ — animal data only
Investigational
Retatrutide (Phase 3) and cagrilintide+semaglutide combinations look poised to become the next tier of primary therapy.
Frequently asked questions
What is the best peptide for weight loss?
Tirzepatide (Zepbound/Mounjaro) currently leads with ~18-22% average weight loss in trials. Semaglutide is close behind at 12-15%. Retatrutide is investigational and shows the largest effect (24.2%) but is not yet approved.
Are AOD-9604 and 5-Amino-1MQ effective?
AOD-9604 has weak human evidence and did not outperform placebo in the largest trial. 5-Amino-1MQ shows promising animal data on fat metabolism but limited human evidence.
Is CJC-1295 / ipamorelin good for weight loss?
These stimulate growth hormone release and can modestly improve body composition (more muscle, less fat) — not the same as weight loss on the scale. Best used alongside training, not as primary weight-loss therapy.
What about tesofensine?
Tesofensine is a triple monoamine reuptake inhibitor (not a peptide) with strong weight-loss data. Not FDA-approved in the US.
Are compounded weight-loss peptides safe?
When prescribed by a licensed clinician and dispensed by a 503A FDA-registered pharmacy — yes. When sold as "research chemicals" online — no.
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Medically reviewed by Kindr Health Clinical Team · Last reviewed 2026-06-19. Compounded medications are prepared by FDA-registered 503A pharmacies and are not FDA-approved drug products.