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A 0.05% BAC legal limit is most common and found in Western European countries

Storage and Shelf Life Proper storage is crucial to maintain the efficacy of your GHK-Cu solution: - Store the mixed solution in a cool, dark place - Refrigeration can extend the shelf life but is not always necessary - Use within 3-6 months for optimal potency - Discard if you notice any changes in color, odor, or consistency Application and Usage Tips Incorporating GHK-Cu into Your Skincare Routine To maximize the benefits of your GHK-Cu solution: - Apply to clean, dry skin - Use once or twice daily, preferably in the evening - Follow with a moisturizer to lock in the benefits - For sensitive skin, start with a lower concentration and gradually increase Potential Side Effects While GHK-Cu is generally well-tolerated, some individuals may experience: - Mild irritation or redness - Temporary tingling sensation - Allergic reactions (rare) If you experience persistent adverse effects, discontinue use and consult a healthcare professional

10.13863/j.issn1001-4454.2025.02.033 154 WangF.JiangZ.GaoJ.MiaoC.SongC.YangY.et al (2025)