What are the considerations and potential benefits of using GHK Cu (Glycyl Histidyl Lysine Copper) in a generally healthy adult female for skin health and hair growth? GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health Peptide Therapy for Pain Management and Healing Core Medical & Wellness GHK Cu as a multifunctional copper peptide: synthesis routes, process engineering and emerging applications Systems Microbiology and Biomanufacturing Springer Nature Link