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doi:10.1001/jama.2013.280490
GHK-Cu was formulated to help provide a reduced appearance of wrinkles and fine lines
Reasons to retry (lower and slower): - The reaction was mild and improving - You started too strong or too often - You were layering incompatible actives - Your barrier was already compromised when you started Reasons to quit: - You had a true allergic reaction (hives, swelling, burning) - Skin reacted badly even at low concentration and frequency - A dermatologist identified contact dermatitis - You simply have better-tolerated options for your goals There is no rule that you must use copper peptides
Around 5-10% experience transient nausea, and 3-7% report occasional lightheadedness in the first week
These two proteins form the structural backbone of firm, elastic skin, and their decline is a major reason skin goes slack after shedding weight
That does not mean the combination is safe
