GHK stands for glycyl-L-histidyl-L-lysine, and it's a natural tripeptide found in the human body in plasma, saliva, and urine made up of three amino acids
[5,8] Melatonin Restoration in Aged Animals Anisimov and colleagues demonstrated that Epithalon administration to aged rats (18 months) restored nocturnal melatonin secretion to levels approximately 64% of those measured in young (3-month) controls a significant recovery from the near-complete suppression observed in untreated aged animals (approximately 18% of young animal levels)
doi: 10.1016/B978-0-12-802997-8.00023-2 3 TranBRosenthalMA
Hormone testing may also be recommended, particularly for patients over 40 or those with symptoms suggesting hormonal imbalance
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