As Dr Oz states on his website about Vitamin C and Skin Care:
Secret #1: Vitamin C
Vitamin C is critical for your body and plays an important role in maintaining healthy, resilient skin. While young skin is full of vitamin C, aging skin naturally loses this nutrient over time. Other factors like exposure to UV light, pollutants and cigarette smoke compound the decline of vitamin C, contributing to signs of aging. The good news is that you can fight back by replenishing your skin’s vitamin C levels to help to combat and even reverse time’s effect on your face.
Your Anti-Aging Rx
Taking vitamin C through a supplement or food is beneficial to your health, but to specifically target signs of aging on your face, topical vitamin C is best. In fact, applying vitamin C to the skin can be 20 times more effective than taking it orally.