One 2013 review even recommends applying a vitamin C serum every 8 hours, or twice daily for the pinnacle of protection
[DOI] [PubMed] [Google Scholar] 156.Mojsov S, Heinrich G, Wilson IB, Ravazzola M, Orci L, Habener JF
Fact: Skin health is holistic
The body needs vitamin B12 to metabolize proteins and fats properly and to turn carbs into glucose, which is used as fuel
Evaluation of efficacy and tolerance of a nighttime topical antioxidant containing resveratrol, baicalin, and vitamin E for treatment of mild to moderately photodamaged skin
Its not just about the results, but also convenience and what really fits your lifestyle