The best time to apply vitamin C serum is generally in the morning. This is because vitamin C is a powerful antioxidant that protects your skin from environmental stressors like UV radiation and pollution, which are more prevalent during the day. Applying it in the morning maximizes its protective benefits.
However, there are some nuances:
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Morning Application: Most dermatologists recommend a morning routine for vitamin C serum application. This is to shield the skin from the damaging effects of free radicals encountered throughout the day. Applying it before moisturizer and sunscreen enhances its effectiveness. ([Source 1, Source 4, Source 5, Source 6, Source 7])
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Morning and Evening Application: For those with less sensitive skin and desiring maximum benefits, applying vitamin C both morning and night is acceptable. ([Source 1, Source 7])
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Evening Application: While less common, some individuals may find it more convenient or better tolerated to apply vitamin C serum at night. This is perfectly acceptable provided they understand the lessened impact of the antioxidant properties overnight ([Source 3]).
Regarding Vitamin C supplements: The timing of vitamin C supplement intake is less critical. It can be taken at any time of day, with or without food. ([Source 2, Source 8, Source 9, Source 10])
In summary: For topical vitamin C serum application, morning is generally recommended for its protective benefits. For vitamin C supplements, timing is less crucial.
