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DOI: 10.1038/s41398-020-01135-3
When vitamin C donates electrons to neutralize free radicals, glutathione can restore vitamin C to its active form, and vitamin C can do the same for glutathione, creating a continuous antioxidant cycle
Mild redness and slight swelling are normal and resolve within minutes to hours
Users stopping vitamin C serums generally report gradual benefit decline over 2-4 months with antioxidant protection loss occurring quickly (days to weeks), skin brightness fading over 1-2 months returning toward baseline, and collagen-related firmness improvements showing variable persistence with 30-50% benefit retention long-term for consistent users
No drug interactions are currently known
