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The short answer: it depends but a reasonable expectation is: At 4 weeks : subtle internal changes and gentle lightening At 8 weeks : more visible brightening and evenness At 12 weeks : notable improvements in tone, radiance, and pigmentation Keep in mind that studies show positive changes in glutathione levels and skin brightness over 412 weeks
AHK-Cu, GHK-NH2, and various synthetic copper-binding sequences have far less mechanism data
6 Because these compounds are not approved by the US Food and Drug Administration (FDA) for use as tanning agents, there is no formal oversight of their production or distribution
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