Sermorelin (Sermorelin acetate)
GHRH Analog · Growth Hormone Releasing Hormone
Overview
Sermorelin is a synthetic 29-amino acid analog of human growth hormone-releasing hormone that stimulates natural growth hormone production while preserving physiological pulsatile patterns. Originally FDA-approved in 1997 for pediatric GH deficiency, it was discontinued in 2008 for manufacturing reasons, not safety concerns.
Subcutaneous injection provides optimal bioavailability for binding GHRH receptors, stimulating pulsatile GH release while maintaining hypothalamic-pituitary axis integrity and allowing natural somatostatin negative feedback.
1.26kg lean mass increase documented in elderly men with improved muscle strength tests.
Endogenous IGF-1 stimulation drives protein synthesis and muscle growth.
Enhanced recovery through physiological GH stimulation.
Doubles 12-hour GH release in elderly subjects over 6 weeks.
Mechanism
Sermorelin is a synthetic 29-amino acid analog of human growth hormone-releasing hormone that stimulates natural growth hormone production while preserving physiological pulsatile patterns. Originally FDA-approved in 1997 for pediatric GH deficiency, it was discontinued in 2008 for manufacturing reasons, not safety concerns.
Subcutaneous injection provides optimal bioavailability for binding GHRH receptors, stimulating pulsatile GH release while maintaining hypothalamic-pituitary axis integrity and allowing natural somatostatin negative feedback.
1.26kg lean mass increase documented in elderly men with improved muscle strength tests.
Research areas
- Sermorelin is a synthetic 29-amino acid analog of human growth hormone-releasing hormone that stimulates natural growth hormone production while preserving physiological pulsatile patterns. Originally FDA-approved in 1997 for pediatric GH deficiency, it was discontinued in 2008 for manufacturing reasons, not safety concerns.
- Subcutaneous injection provides optimal bioavailability for binding GHRH receptors, stimulating pulsatile GH release while maintaining hypothalamic-pituitary axis integrity and allowing natural somatostatin negative feedback.
- 1.26kg lean mass increase documented in elderly men with improved muscle strength tests.
- Endogenous IGF-1 stimulation drives protein synthesis and muscle growth.
- Enhanced recovery through physiological GH stimulation.
- Doubles 12-hour GH release in elderly subjects over 6 weeks.
- Decreased adiposity and improved lean mass distribution.
- Improved skin thickness and quality.
- Preserves natural axis function without suppression.
- Maintains physiological GH release patterns.
Research notes
- Injection site reactions (16.7% of patients - generally mild)
- Nasal irritation (intranasal route)
- Signs of pituitary tumor growth (headaches, vision changes)
- Severe injection site reactions or generalized allergic responses
- Uncontrolled diabetes or significant glucose intolerance
- New onset or worsening malignancy symptoms
- Active malignancy
- Pituitary tumors
- Pregnancy
Pharmacokinetics
- Subcutaneous injection provides optimal bioavailability for binding GHRH receptors, stimulating pulsatile GH release while maintaining hypothalamic-pituitary axis integrity and allowing natural somatostatin negative feedback.
References
- pubmed.ncbi.nlm.nih.gov/2877535/
- pubmed.ncbi.nlm.nih.gov/8772599/
- pubmed.ncbi.nlm.nih.gov/9141536/
- pubmed.ncbi.nlm.nih.gov/1379256/
- pubmed.ncbi.nlm.nih.gov/18046908/
FAQs
Why was sermorelin discontinued if it was FDA-approved and safe?
Sermorelin was discontinued in 2008 for manufacturing reasons, not safety concerns. It was approved in 1997 and had a solid safety record, but the manufacturer stopped production. This left a gap in the market—sermorelin is now available through research/compounded sources but not as a branded pharmaceutical.
How does sermorelin preserve natural GH patterns better than taking GH directly?
Sermorelin stimulates your pituitary to release GH in its natural pulsatile pattern (high at night, low during day). Direct GH injection creates constant levels, suppressing your natural axis. Sermorelin preserves the hypothalamic-pituitary-axis (HPA) feedback loop, meaning you maintain natural regulation rather than becoming dependent on external hormones.
Why shouldn't I eat food 2+ hours before sermorelin injection?
Carbohydrates and high blood sugar suppress GH release. Eating before injection blunts your GH response by 50-80%, making the injection ineffective. Bedtime administration on an empty stomach ensures maximum GH secretion from the natural nocturnal pulse your body is primed to produce.
Can I combine sermorelin with GHRP-2 for even bigger GH increases?
Yes, and it's highly effective. GHRH + GHRP-2 combination produces 54-fold GH increases vs 20-fold with GHRH alone. However, start cautiously and monitor for joint pain/water retention. The synergy is excellent for body composition but requires more careful dose management than either alone.