If efficacy favors tretinoin, tolerance decisively favors GHK-Cu and for many people, tolerance is what determines whether a product is actually used long enough to work
These data pointed to an unexpected similarity between Gclc -deficient FoB and Gclc -sufficient MZB
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if the patient stops the therapy or is exposed to sunlight without sufficient protection, the skin may again darken
14 In contrast, Weschawalit et al 3 reported a statistically significant effect of glutathione as a skin-lightening agent, but this was limited to a group of participants aged older than 40 years who received GSH, a reduced form of glutathione, on the sun-exposed area of the right forearm
ACS Applied Materials & Interfaces