Best Peptides for Fat Loss: An Overview
"Fat loss" is one of the most common reasons people explore peptides. Several compounds are associated with metabolism and body composition — here's an overview of the categories people discuss.
The metabolic agonists
The heavy hitters in this space are the incretin-based compounds:
- Semaglutide — a GLP-1 agonist that reduces appetite and slows gastric emptying.
- Retatrutide — a triple agonist (GLP-1/GIP/glucagon) with strong early weight-loss data.
- Cagrilintide — a long-acting amylin analog, often discussed alongside semaglutide.
Growth hormone secretagogues
Compounds like CJC-1295 and Ipamorelin are associated with body composition by supporting the body's own growth-hormone output, which some use as part of a recomposition approach.
Targeted fat-metabolism peptides
AOD-9604 is a fragment associated specifically with fat metabolism, often discussed for use around fasted cardio.
The reality check
No peptide replaces the fundamentals. Appetite-reducing compounds make a calorie deficit easier to maintain, but protein intake, resistance training, and consistency are what protect lean mass and drive lasting results. The people who succeed track everything — dose, weight, and trend — so they can see what's actually working.
BioHack charts your weight over time, tracks progress photos, and logs every dose so you can see the trend clearly.
Frequently asked questions
What peptides are used for fat loss?
The GLP-1 class — semaglutide, tirzepatide, and retatrutide — dominates this space. Others sometimes discussed include AOD-9604 and various growth hormone secretagogues, though the evidence base varies considerably.
Which peptide is most effective for weight loss?
GLP-1 receptor agonists have the strongest clinical evidence. Tirzepatide (a dual agonist) is FDA-approved; retatrutide (a triple agonist) shows promising trial data but is not approved.
Do fat loss peptides work without diet changes?
GLP-1 compounds work substantially by reducing appetite, which drives a calorie deficit. They aren't a replacement for nutrition — they're a tool that makes adherence easier.
BioHack turns everything above into a tool — a reconstitution calculator, dose advisor, cycle planner, and 45-peptide library, all in one app.
Open BioHack →For educational and research purposes only. Not medical advice. Consult a physician before starting any peptide protocol. BioHack is a tracking tool and does not sell peptides.