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The hair root area contains melanocytes, which absorb the laser energy and convert it into heat energy, which destroys the hair, the hair root, and the tissues connected to the hair root, including the blood vessels that supply it with nutrients, making it unable to produce stem cells that promote hair growth
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Isaka et al., 1996
This is a general challenge for signal peptides and is not unique to GHK-Cu
8.2 Summary of RCTs Early studies using low-dose NAC (200 mg TID) showed no significant benefit over placebo in PEFR, weight, antibiotic use, cough, sputum viscosity, or symptom perception (102)