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Wu, L., Zhang, H., Wu, M., Zhong, Y., Liu, X., & Jiao, Z

Who Should Avoid It Not for use on broken or infected skin Avoid eye area - may cause irritation Do not use if allergic to copper or peptides Not recommended during acute skin infections Stop Right Away If You Notice Persistent scalp irritation, itching, or burning Allergic reaction: rash, hives, swelling Increased hair shedding that doesn't improve after 4-6 weeks Signs of copper sensitivity: metallic taste, nausea Skin discoloration at application site Any unexpected adverse reactions Milder Signs to Watch For How Long Should a AHK-Cu Cycle Last

As for brands, Illiyoon and Beauty of Joseon underscore the influence of K-beauty, with a focus on calming, plant-based ingredients rooted in tradition, whereas Byoma represents a rising consumer focus on strengthening the skins barrier