GHK-Cu (Copper Peptide) vs Hexarelin

A detailed comparison to help you understand the differences and choose the right peptide for your research goals.

GHK-Cu (Copper Peptide)

GHK-Cu is a naturally occurring copper peptide found in human plasma, saliva, and urine. It plays important roles in wound healing, tissue repair, and has shown anti-aging properties in research.

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Hexarelin

Hexarelin is a potent synthetic hexapeptide growth hormone secretagogue. It provides the strongest GH release among GHRPs but is associated with rapid desensitization of receptors.

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Side-by-Side Comparison

Aspect	GHK-Cu (Copper Peptide)	Hexarelin
Dose Range	1 mg–2 mg	100 mcg–300 mcg
Frequency	1x daily	2x daily
Cycle Length	4–8 weeks	8–12 weeks
Route	subcutaneous	subcutaneous
Mechanism	Attracts immune cells and fibroblasts to wound sites, stimulates collagen and glycosaminoglycan synthesis, promotes angiogenesis, and has antioxidant effects. Modulates gene expression related to tissue repair.	Acts as a ghrelin mimetic with high potency at the GHS receptor. Provides powerful GH release but receptor desensitization occurs faster than with other GHRPs, requiring cycling.
Typical Dosage	Topical: Applied as serum or cream 1-2 times daily. Injectable: 1-2mg daily for research purposes. Microneedling protocols often use 0.5-1%.	Typical dosing: 100-200mcg administered 2-3 times daily for 4-6 weeks, followed by an equal off period to allow receptor resensitization.
Administration	Most commonly used topically for skin applications. Can be injected subcutaneously for systemic effects. Often combined with microneedling for enhanced skin penetration.	Subcutaneous injection. Cycling is essential to maintain effectiveness. Often used in short bursts rather than continuous protocols.
Side Effects	Topical use is generally well-tolerated. May cause temporary skin irritation or redness in sensitive individuals. Injectable use may cause injection site reactions.	Water retention, cortisol and prolactin increase, hunger (moderate), tingling, and potential blood pressure effects.
Best For	Recovery & Healing	Muscle Growth Recovery & Healing