Sun, Skin, and Antioxidants: Eating for Sun Protection from the Inside Out
Midsummer has a way of pulling us outdoors — long evenings, garden harvests, beach days, cookouts that stretch past sunset. It's also the season when our skin works hardest against a steady barrage of ultraviolet (UV) radiation. While a good sunscreen remains the first line of defense if you plan to be outside for a longer period of time, an often-overlooked layer of protection actually starts on your plate. As a naturopath, I think of these nutritional tools as a kind of "internal sunscreen" — not a replacement for topical SPF, but a complementary strategy that builds resilience in the skin over time. Need a good sunscreen without the unhealthy chemicals? Check out EWG.org’s top-rated list of sunscreens HERE!
How UV Damage Actually Happens
UV radiation reaching the skin is mostly UVA, with a smaller but more intense contribution from UVB. When these rays penetrate the skin, they generate reactive oxygen species — unstable molecules that damage cell membranes, proteins, and DNA. This oxidative cascade is what drives sunburn, premature wrinkling, and, over years, increases skin cancer risk. The body has its own antioxidant defenses, but they can be overwhelmed during heavy sun exposure. That's where diet comes in: antioxidant-rich foods help replenish and support those defenses from within.
The Carotenoid Family: Beta-Carotene and Lycopene
Carotenoids are the pigments that give carrots, sweet potatoes, mangoes, and tomatoes their vibrant orange and red hues, and they're among the most studied dietary compounds for skin photoprotection. Research indicates that carotenoids such as beta-carotene, lycopene, lutein, and astaxanthin have photoprotective effects, both through directly absorbing light and through their antioxidant action of scavenging reactive oxygen species, as well as by influencing UV-related gene expression and inflammation.
Importantly, this protection builds gradually rather than acting like an instant shield. Studies that found a meaningful reduction in UV-induced redness used supplementation lasting at least seven weeks at a total carotenoid dose of 12 milligrams or more per day, whereas shorter three-to-four-week trials showed no protective effect. In other words, this is a long-game strategy: the benefits come from consistent intake over the season, not a single tomato salad before heading to the beach.
So, although dietary carotenoids offer less sun protection than topical sunscreen when measured in sun-protection-factor terms, an optimal supply of these micronutrients in the skin strengthens its basic defenses against UV exposure and supports long-term skin health. Lycopene deserves a special mention here: it concentrates in facial skin and has been actively studied for its protective action against UV-induced skin damage.
Where to find them: carrots, pumpkin or other winter squash, sweet potato, mango, papaya, and apricots for beta-carotene; tomatoes (especially cooked, as heat increases bioavailability), watermelon, pink grapefruit, and guava for lycopene.
Vitamin C and Vitamin E: A Protective Partnership
Vitamins C and E are well known individually as antioxidants, but research consistently points to something more interesting: they work better together. Laboratory studies applying both vitamins to skin before UV exposure found that the combination of vitamin C and vitamin E provided significantly greater protection against sunburn and DNA damage than either vitamin used alone, with effects that strengthened over several days of use. While that particular research looked at topical application, it illustrates the broader principle naturopaths lean on: these two nutrients work in complementary "zones" within the body, vitamin C in watery cellular environments and vitamin E within fat-based cell membranes, covering more ground together than apart.
Dietary sources matter here too, and they overlap nicely with what's in season: citrus fruit, kiwi, capsicum, and leafy greens for vitamin C; nuts, seeds, and avocado for vitamin E.
Polyphenols and the Bigger Antioxidant Picture
Beyond carotenoids and vitamins, plant polyphenols — found in berries, green tea, dark chocolate, and colorful vegetables — contribute their own layer of defense. A recent review of dietary supplements for skin photoaging noted that flavanol-rich compounds such as those in cocoa show antioxidant properties, support circulation, and help protect the skin barrier, contributing to the broader case for polyphenol-rich eating in sun-exposed months. Chaga mushroom is also an interesting possibility, as it contains polyphenols, melanin and anti-inflammatory compounds that may protect the skin against photoaging as well. Studies are underway, but no human trials have been done as yet to prove out these theories. It is certainly worthwhile to add chaga mushroom, however, as it offers many other established benefits as well!
Putting It Into Practice This Midsummer
From a naturopathic perspective, the goal isn't to chase a single "magic" nutrient but to build a consistently colourful plate throughout summer: think roasted sweet potato and grilled tomato salads, berries with breakfast, leafy greens at lunch, a handful of nuts as a snack, and citrus to finish a meal. Pair this with good hydration, since well-hydrated skin maintains its barrier function more effectively in heat, and continue using protective clothing, or a broad-spectrum sunscreen if needed as your primary defense.
Think of food-based antioxidants as building the foundation underneath your sunscreen, not a substitute for it. Over weeks of consistent, colourful eating, you're giving your skin extra tools to manage the oxidative stress that midsummer sun inevitably brings, and enjoy your time outside safely and happily!
This article is for general educational purposes and isn't a substitute for personalised medical or dermatological advice. If you have specific skin concerns or are considering supplementation, please consult your healthcare provider.
References
Mojzer, E. B., et al. (2019). Do We Utilize Our Knowledge of the Skin Protective Effects of Carotenoids Enough? PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC6719967/
Stahl, W., & Sies, H. (2012). β-Carotene and other carotenoids in protection from sunlight. The American Journal of Clinical Nutrition / ScienceDirect. https://www.sciencedirect.com/science/article/pii/S0002916523030265
Mein, J. R., et al. Lycopene presence in facial skin corneocytes and sebum and its association with circulating lycopene isomer profile. PMC. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6475749/
Greul, A. K., et al. (2017). Molecular evidence that oral supplementation with lycopene or lutein protects human skin against ultraviolet radiation. British Journal of Dermatology. https://academic.oup.com/bjd/article/176/5/1231/6661085
Lin, F. H., et al. (2003). UV photoprotection by combination topical antioxidants vitamin C and vitamin E. ScienceDirect. https://www.sciencedirect.com/science/article/abs/pii/S0190962203007813
Darr, D., et al. Effectiveness of antioxidants (vitamin C and E) with and without sunscreens as topical photoprotectants. PubMed. https://pubmed.ncbi.nlm.nih.gov/8869680/
Protective Effects of Lanostane Triterpenoids from Chaga Mushroom in Human Keratinocytes Against Inflammatory and Oxidative Stresses. 2023. PubMed. https://pmc.ncbi.nlm.nih.gov/articles/PMC10454022/
Effectiveness of dietary supplements for skin photoaging in healthy adults: a systematic review and meta-analysis of randomized controlled trials. (2025). Frontiers in Medicine. https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2025.1582946/full
The Role of Phytonutrients in Skin Health. PMC. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3257702/