Chronic administration of neuropeptide Y into the lateral ventricle inhibits both the pituitary-testicular axis and growth hormone and insulin-like growth factor I secretion in intact adult male rats
Key observation: All dose groups began at 0.5mg with gradual escalation over several weeks before reaching maintenance doses
Reported reactions included nausea, vomiting, lightheadedness, chills, body aches and sneezing
Accessed September 7, 2025
Benefits of combining: Injectable GHK-Cu promotes collagen throughout body, including skin Topical retinol addresses surface texture and wrinkles Complementary mechanisms Faster, more dramatic skin improvements Protocol: Injectable GHK-Cu: 1-2mg, 3-5x weekly subcutaneous Topical retinol: Nightly (or as tolerated) Topical peptide serum: Optional additional layer See our copper peptides guide for injectable GHK-Cu protocols
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