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Vitamin C cant fight the sun on its own, so that pigmentation will return faster without daily sun protection

"Depending on the type of peptide, some peptide serums can also help to improve the appearance of expression lines as well as boost radiance and hydration in the skin." "It's important to note that unlike collagen, which is too large to penetrate the skin topically, peptides are shorter chains and are able to penetrate the skin to signal to the skin to boost collagen production," she says

Reduced glutathione (GSH), in its free form, can easily degrade in the stomach due to acidic pH and enzyme action, which hinders its absorption and limits its use

Dong, D.C