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Unlike many high-potency anti-aging ingredients (e.g., retinol), GHK-Cu has very low irritation, making it suitable for sensitive skin, post-laser/chemical peel repair formulas, long-term daily anti-aging formulations, and clean beauty products

However, there are typical starting points that are generally recommended by doctors

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If you are testing during a period of heavy training, you might see lower levels than during a rest week