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On the other hand, research by Micic et al
A perspective: engineering periosteum for structural bone graft healing
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
In addition, glutathione can be sourced from whey protein , but only if its bioactive and non-denatured
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