Growth Hormone Peptides: Secretagogues & Releasing Hormones
Growth hormone secretagogues are peptides that stimulate the body's natural production of growth hormone. This category includes GHRH analogs (CJC-1295, Sermorelin, Tesamorelin), GHRPs (Ipamorelin), and non-peptide secretagogues (MK-677/Ibutamoren).
Unlike direct HGH administration, which bypasses the pituitary and can cause supraphysiologic GH spikes, secretagogues work upstream and preserve natural pulsatile secretion patterns. Evidence quality varies significantly across the category. Tesamorelin is FDA-approved for HIV-associated lipodystrophy. Sermorelin had FDA approval (withdrawn for commercial reasons, not safety). CJC-1295 and Ipamorelin are popular in anti-aging clinics but lack FDA approval and robust clinical data in healthy adults. Expected effects include modest improvements in sleep depth, body composition, and recovery — not the dramatic changes often advertised. Side effects include water retention, insulin resistance with chronic use, and potential accelerated tumor growth in patients with subclinical cancers (a theoretical concern shared with all GH-axis therapies).
5 compounds in this category
Key Takeaways
- Tesamorelin is FDA-approved; most other GH peptides are compounded off-label
- Secretagogues preserve natural GH pulsatility better than direct HGH injection
- Effects are generally modest — improved sleep and body composition, not dramatic anti-aging
- Chronic use can induce insulin resistance and should be monitored
- IGF-1 levels should be tracked to avoid supraphysiologic exposure
Compounds in This Category
CJC-1295CJC-1295 DAC, CJC-1295 without DAC
A growth hormone-releasing hormone (GHRH) analog studied for its ability to increase growth hormone and IGF-1 levels.
IpamorelinNNC 26-0161
A selective growth hormone secretagogue that stimulates GH release without significantly affecting cortisol or prolactin.
SermorelinGeref, GHRH(1-29)NH2
A growth hormone-releasing hormone analog with a long history of clinical use for GH deficiency diagnosis and therapy.
TesamorelinEgrifta, TH9507
An FDA-approved GHRH analog used for HIV-associated lipodystrophy, with research into broader metabolic and cognitive applications.
MK-677Ibutamoren, Nutrobal
An oral ghrelin mimetic (not a peptide) that stimulates growth hormone release. Has extensive human data but has not achieved FDA approval.
Frequently Asked Questions
Are growth hormone peptides legal?
Tesamorelin is FDA-approved. Sermorelin lost approval for commercial reasons. CJC-1295 and Ipamorelin are not FDA-approved but are available through compounding pharmacies in a regulatory gray zone.
Do GH peptides build muscle like HGH?
Effects are modest compared to exogenous HGH. Most users see small improvements in lean mass and recovery over 3–6 months, not rapid hypertrophy.
Are GH peptides safer than HGH injections?
Theoretically yes, because they work through natural pituitary regulation. But long-term safety data in healthy adults remains limited for most compounds.
Who should not use growth hormone peptides?
Anyone with active cancer, proliferative retinopathy, uncontrolled diabetes, or a history of pituitary tumors should avoid GH-axis therapies.
How long until I see results?
Sleep quality improvements often appear within 2–4 weeks. Body composition changes typically require 3–6 months of consistent use.