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Benefits mental health Supports neurotransmitter regulation, reduces fatigue, and may help ease stress and depressive symptoms

This does not invalidate the findings but adds a potential source of bias Single-blind only: While the investigator assessing photos was blinded, patients knew whether they received the active serum or saline, which could influence self-reported satisfaction scores No long-term follow-up: The study ended at 6 months

The mechanism of action has not been fully elucidated, but it is thought that GHK-Cu may promote fibroblast proliferation resulting in collagen synthesis which may in turn promote increased scalp health and blood flow to hair follicles

If left at room temperature for 8-12 hours, there will likely be some degradation, but it may not be a total loss