Add greens to tomato-based pasta sauce, with a bit of fat to improve carotenoid absorption, and you're golden (rather than red).
Lycopene, the red pigment of tomatoes and watermelon, is IMO the single most important direct antioxidant for photoprotection. It has the highest skin concentration among carotenoids and ranks high as a physical quencher of UV generated singlet oxygen.
Stahl W et al. 2001. Dietary tomato paste protects against ultraviolet light–induced erythema in humans. The Journal of nutrition, 131(5), pp.1449-1451.
Rizwan M et al. 2011. Tomato paste rich in lycopene protects against cutaneous photodamage in humans in vivo: a randomized controlled trial. British Journal of Dermatology, 164(1), pp.154-162.
β-carotene is the second most important carotenoid in skin. Greens have more than carrots. Note all the carotenoids compete for absorption, which may account higher relative risk seen with β-carotene supplementation and smoker's lung cancer in a couple of important trials from the 90s.
Mathews-Roth MM et al. 1972. A clinical trial of the effects of oral beta-carotene on the responses of human skin to solar radiation. Journal of Investigative Dermatology, 59(4), pp.349-353.
Wolf C et al. 1988. Do oral carotenoids protect human skin against ultraviolet erythema, psoralen phototoxicity, and ultraviolet-induced DNA damage?. Journal of investigative dermatology, 90(1), pp.55-57.
Garmyn M et al. 1995. Effect of beta‐carotene supplementation on the human sunburn reaction. Experimental dermatology, 4(2), pp.104-111.
Gollnick HPM et al. 1996. Systemic beta carotene plus topical UV-sunscreen are an optimal protection against harmful effects of natural UV-sunlight: results of the Berlin-Eilath study. EJD. European journal of dermatology, 6(3), pp.200-205.
Lee J et al. 2000. Carotenoid supplementation reduces erythema in human skin after simulated solar radiation exposure. Experimental Biology and Medicine, 223(2), pp.170-174.
Stahl W et al. 2000. Carotenoids and carotenoids plus vitamin E protect against ultraviolet light–induced erythema in humans. The American journal of clinical nutrition, 71(3), pp.795-798.
Heinrich U et al. 2003. Supplementation with β-carotene or a similar amount of mixed carotenoids protects humans from UV-induced erythema. The Journal of nutrition, 133(1), pp.98-101.
Lutein, found in kale & other greens, is invaluable for retinal UV protection, but isn't terribly important in skin..Zeaxanthin is comparably effective in the eyes, but doses from food are rather low. Rounding out the cryptoxanthins is asthaxanthin sourced from red pond scum, which is the most potent singlet oxygen quencher but supplements have small doses that aren't cost effective compared to a dietary mix of lycopene, β-carotene and lutein from tomato sauces and greens.
Palombo P et al. 2007. Beneficial long-term effects of combined oral/topical antioxidant treatment with the carotenoids lutein and zeaxanthin on human skin: a double-blind, placebo-controlled study. Skin pharmacology and physiology, 20(4), pp.199-210.
Cocoa flavanols likely work by another mechanism, upregulating endogenous antioxidant responses and inhibiting inflammatory ones.
Heinrich U et al. 2006. Long-term ingestion of high flavanol cocoa provides photoprotection against UV-induced erythema and improves skin condition in women. The Journal of nutrition, 136(6), pp.1565-1569.
I'd caution against either high-dose riboflavin or iron supplements if you're prone to burns. The first is a photosensitizer, the later, when poorly liganded, propagates singlet oxygen damage via the Fenton reaction.
Edited by Darryl, 14 February 2016 - 04:35 AM.