Best Peptides for Fat Loss
Growth hormone secretagogues — peptides that stimulate the pituitary gland to release more growth hormone — have attracted significant research and community interest for their potential to shift body composition toward less fat and more lean mass. This guide examines the evidence for the most studied fat loss peptides.
How Peptides Aid Fat Loss
Growth hormone (GH) plays a direct role in lipolysis — the breakdown of stored fat for energy. As GH levels decline with age (a process called somatopause), fat accumulation — particularly visceral fat — tends to increase. GH secretagogue peptides work by stimulating the body's own pituitary gland to produce more GH in a pulsatile, physiologically normal pattern.
This is distinct from exogenous HGH administration. Because secretagogues work through the pituitary's natural feedback loops, they are less likely to suppress endogenous GH production and may carry a more favorable safety profile compared to direct HGH injection.
Key Mechanisms
- Stimulating GH release from the pituitary (GHRH pathway)
- Increasing IGF-1 levels, which mediates many of GH's metabolic effects
- Enhanced lipolysis — mobilizing stored fat as an energy source
- Potential improvements in lean muscle retention during caloric deficit
Important: The information on this page is for educational purposes only and is not medical advice. Always consult a qualified healthcare professional before using any peptide.
Top Fat Loss Peptides
CJC-1295 and Ipamorelin are the two most studied and most commonly used GH secretagogues for body composition purposes. They are frequently used together.
CJC-1295
CJC-1295 is a modified GHRH analog with an extended half-life compared to native GHRH. It stimulates sustained GH release and has been studied in human clinical trials for its effects on GH and IGF-1 levels. It forms the foundation of many GH peptide stacks aimed at fat loss and body recomposition.
Read full guide →Ipamorelin
Ipamorelin is a selective GH secretagogue and ghrelin mimetic. Unlike older secretagogues, it stimulates GH release with minimal effect on cortisol and prolactin — making it one of the “cleanest” GH peptides available. Combined with CJC-1295, it creates a synergistic GH pulse that mimics the body's natural release pattern.
Read full guide →GH Secretagogue Stacks
CJC-1295 and Ipamorelin work through different but complementary mechanisms: CJC-1295 acts on GHRH receptors while Ipamorelin acts on ghrelin receptors (GHSR). Used together, they produce a more robust GH pulse than either compound alone.
This combination is one of the most popular in the community for body composition goals. For a detailed breakdown of how these two peptides compare and interact, see our CJC-1295 vs Ipamorelin comparison.
Typical Stack Considerations (Community-Reported)
- Often dosed pre-sleep to align with natural GH pulses
- Fasted state dosing is commonly reported to maximize GH release
- Cycles of 12 weeks on, 4 weeks off are common in the community
These are community-reported protocols only. Not medical advice.
Safety Considerations
GH secretagogues carry a different risk profile than anabolic steroids or direct HGH. Because they work through the pituitary's own regulatory mechanisms, the risk of GH excess is naturally limited by negative feedback. However, elevated GH and IGF-1 over time do carry theoretical risks including fluid retention, joint discomfort, and potential effects on insulin sensitivity.
Neither CJC-1295 nor Ipamorelin is FDA-approved for human use outside of research settings. Individuals with a history of cancer, diabetes, or pituitary conditions should consult a physician before considering these compounds.
Where to Buy
Quality matters enormously with GH peptides — underdosed or impure products are common in the market. We vet vendors for third-party COA compliance and community reputation so you can source with confidence.
View our vetted peptide sources →Affiliate Disclosure: This page contains affiliate links. We only recommend vendors we have personally vetted for COA compliance. We may earn a commission at no extra cost to you.