GHK-Cu vs GHRP-6
Well Studied vs Well Studied
synergistic Mechanism-based · 47% GHK-Cu and GHRP-6 work through complementary pathways. Growth hormone signaling supports tissue repair processes. A well-established combination in recovery protocols.
Molecular Data
GHK-Cu GHRP-6
Weight 404.96 Da 873 Da
Half-life 0.5-2 hours 15-60 minutes
Chain 3 amino acids 6 amino acids
Type Copper tripeptide Synthetic hexapeptide
Key Benefits
GHK-Cu
01 Enhanced collagen production (70% increase in type I and III)
02 Improved skin elasticity
03 Reduced fine lines and wrinkles
04 Accelerated wound healing
05 Hair growth stimulation
06 Antioxidant protection
GHRP-6
01 Potent stimulation of natural growth hormone release
02 Significant increase in appetite (beneficial for bulking/weight gain)
03 Enhanced muscle growth through elevated GH and IGF-1
04 Improved fat metabolism and body composition
05 Cardioprotective effects observed in research
06 Enhanced recovery from exercise and injury
07 Cytoprotective and anti-inflammatory properties
08 Maintains natural GH pulsatile release
Dosing Protocols
GHK-Cu
0.5-2% topical or 1-3mg injectable / 1-2x daily
Systemic anti-aging 1-2mg 1x daily
Enhanced regeneration 2-3mg 1-2x daily
GHRP-6
100-300 mcg per injection / 2-3 times daily (morning, post-workout optional, before bed)
GH optimization 100 mcg 2-3x daily
Enhanced results 200-300 mcg 2-3x daily
With GHRH (synergy) 100 mcg each 2-3x daily
Appetite/bulking 100-200 mcg Before meals
Side Effects
GHK-Cu
Mild skin irritation initially (usually resolves)
Increased photosensitivity
GHRP-6
Intense hunger/increased appetite (most notable side effect)
Water retention
Tingling or numbness in extremities
Tiredness or lethargy after injection
Mild headache
Contraindications
Known copper sensitivity or Wilson's disease
Active skin infections at application site
Pregnancy or breastfeeding (injectable)
Active cancer or history of cancer
Pregnancy or breastfeeding
Pituitary disorders
Diabetes (use with caution)
WADA prohibited for competitive athletes
Research Evidence
GHK-Cu GHRP-6
Status Well Studied Well Studied
References 5 studies 3 studies
Latest July 2025 —
FDA Approved No No
This comparison is for educational and research purposes only. Consult a healthcare professional before use.