Also known as DHA, this FDA-approved self-tanning ingredient is found in most bottled-bronzers and also has the endorsement of the Skin Cancer Foundation and American Medical Society.
8. Fitzpatrick Scale
This scientific classification system divides all skin types and tones into six categories based on pigmentation and genetic history. Used by dermatologists to determine the risk of developing skin cancer, this scale is also referred to in studies about tanning habits.
9. Free Radicals
Found in poisons like cigarette smoke and car exhaust, these reactive molecules damage cells and accelerate the aging process by attacking collagen and elastin reserves. Antioxidants such as vitamins E and C interact with and halt free radicals from wrecking havoc. Get your fill via wheat germ, apricots and leafy greens like kale and spinach.
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10. Internal SPFs
Get ready for some freaky science: certain foods and drinks contain a touch of SPF (most ingested grades hover around 2) that can help you fight harmful rays when you include them in your regular diet. Not substitutes for topical SPF protection, these good-for you eats are also usually rich in anti-oxidants. Try red wine, chocolate and tomatoes.