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https://s3-media0.fl.yelpcdn.com/bphoto/bA5e8TTwRWEygDhZRtXaeQ/180s.jpg Human extrapolation using FDA body-surface-area scaling yields roughly 1 to 2 micrograms per kilogram, translating to approximately 100 to 200 micrograms for an average adult Size:50Kg cream for sun spots and age spots Why GHK-Cu Can Make Skin Look Worse First - YouTube