Journal of the American Academy of Dermatology, 2003 · n=10 · rct · industry-funded
In vivo study (n=10): combination of 15% vitamin C + 1% vitamin E provided 4-fold photoprotection against UV-induced erythema and sunburn cells, compared to 2-fold for vitamin C alone and negligible protection for vitamin E alone; establishes synergistic antioxidant network in skin