• Do use GHK-Cu when tissue repair, skin quality, collagen support, inflammation control, or recovery is the goal. It is best positioned for structural repair, skin barrier support, connective tissue health, scar remodeling, and antioxidant defense. • Do understand that GHK-Cu is copper-based. This matters because anyone with copper metabolism problems, high copper levels, or poor copper clearance should avoid it unless cleared by a medical professional. • Do avoid GHK-Cu if you have Wilson’s disease or any diagnosed copper-storage disorder. These conditions already involve abnormal copper handling, and adding copper-based compounds can be unsafe. • Do avoid GHK-Cu if bloodwork shows high copper, low ceruloplasmin, unexplained liver enzyme issues, or suspected copper overload. These are not situations to experiment with a copper peptide. • Do be careful if you already take copper supplements or high-copper mineral formulas. Stacking too much copper input can increase the risk of imbalance, oxidative stress, nausea, headaches, fatigue, mood changes, or liver stress. • Do support it with clean nutrition and enough protein. GHK-Cu works best when the body has the building blocks needed for collagen, elastin, skin repair, and tissue remodeling. • Do keep inflammation low while using it. Alcohol, junk food, poor sleep, overtraining, smoking, and high stress can all work against repair and skin recovery. • Do track skin quality, wound healing, scar texture, inflammation, recovery, hair quality, and energy. These markers are more useful than expecting one instant effect. • Do be cautious if you have very reactive skin, rosacea, eczema, or mast-cell-type sensitivity. GHK-Cu may support inflammation balance, but sensitive users should watch for irritation, flushing, itching, redness, or flare-ups. • Do stop use if you notice strong irritation, rash, unusual swelling, breathing issues, chest tightness, dizziness, or signs of allergic reaction. Those are not normal “adjustment” effects. • Don’t use GHK-Cu if you have Wilson’s disease, known copper overload, or a copper-storage disorder. This is the biggest non-negotiable caution because GHK-Cu directly involves copper biology. • Don’t use it blindly if you have liver disease or unexplained liver problems. Copper is processed and regulated heavily through the liver, so poor liver function can increase risk. • Don’t use it blindly if you have severe kidney disease. Poor clearance can make mineral and metabolic imbalances harder to manage. • Don’t stack it with extra copper unless there is a clear reason. More copper is not automatically better and can create problems if the body cannot regulate it properly. • Don’t treat GHK-Cu as only a cosmetic skin peptide. It is better understood as a repair and copper-signaling peptide that affects skin, tissue remodeling, mitochondria, inflammation, and structural recovery. • Don’t expect GHK-Cu alone to fix hair loss. Hair loss can involve DHT sensitivity, inflammation, blood flow, hormones, nutrition, and genetics, so GHK-Cu should not be treated as a complete solution by itself. • Don’t use it while ignoring wound-care basics. Dirty skin, poor hygiene, picking, friction, and repeated irritation can ruin the repair environment. • Don’t overdo exfoliants, harsh skincare, acids, retinoids, or aggressive procedures while using topical GHK-Cu. Too much irritation can work against the skin-repair process. • Don’t use it as an excuse to keep inflammation high. Poor sleep, alcohol, smoking, poor diet, and high stress can all weaken collagen repair, skin quality, and recovery. • Don’t assume more is better. GHK-Cu is about balanced signaling and copper delivery, not flooding the body with more copper. • Don’t ignore signs of copper imbalance. Unusual nausea, metallic taste, headaches, mood changes, fatigue, abdominal discomfort, yellowing skin/eyes, or dark urine should be taken seriously.