Summer Reminder: Secrets for Healthy, Tanned Skin

Editorial note: This article was previously published and updated according to scientific and informative criteria. The information is for informational purposes only and does not replace medical advice.

IN BRIEF

• Sun exposure protects and harms: UV rays stimulate vitamin D synthesis but are the main cause of photoaging and increase the risk of skin cancer.
• Topical protection remains primary: broad-spectrum sunscreens and correct application methods reduce damage even at a molecular level.
• Diet and supplements (carotenoids, lycopene, antioxidant mixtures, omega-3) can offer systemic support for skin defense, but do not replace sunscreen. [see Scientific Research]
• Vitamin D is synthesized in the skin with short but regular exposures; avoiding intense exposures as a strategy to obtain vitamin D is not recommended.
• Available evidence varies in quality: many observations are promising but require prudent and contextual interpretation.

Abstract: what does science say?

Science recognizes two primary effects of sun exposure: cutaneous vitamin D production and damage from ultraviolet radiation, which promotes inflammation, oxidative stress, collagen alterations, and cancer risk. Experimental and clinical evidence indicates that regular use of broad-spectrum sunscreens reduces erythema, molecular alterations, and signs of photoaging; oral interventions (carotenoids like beta-carotene or lycopene, antioxidant combinations, and in some contexts omega-3) can increase skin resistance to erythema and modulate inflammatory responses as a complement to topical protection. However, the effect is dose- and time-dependent (e.g., weeks/months to accumulate carotenoids in the skin) and evidence varies from controlled to observational studies; therefore, recommendations must consider phototype, exposure context, and individual risks.

MAIN SECTION

How the sun affects the skin and what the risks are

Solar radiation contains bands with different energy: UVA (more penetrating), UVB (more erythemogenic), and UVC (atmospheric filter). Exposure produces chemical reactions that generate free radicals, damage DNA, and activate pathways that degrade collagen and elastin. These mechanisms explain erythema (sunburn), darkening (increased melanin), cutaneous photoaging, and increased risk of carcinomas and melanoma. Responses depend on phototype, exposure history, and genetic and hormonal factors; DNA repair capacity and pigmentation modulate susceptibility to damage. In summary, the sun is a resource but also an agent of biological stress: combined prevention reduces both acute and chronic damage [1].

Preparing the skin for exposure: aesthetic routine and safety

Exfoliation, hydration, and skin barrier integration

Before exposure, a routine that maintains an intact skin barrier is useful: cleanse with gentle products, exfoliate moderately to remove dead cells and promote product absorption, and hydrate with cosmetics that retain water. Creams or serums with humectant ingredients (e.g., glycerin, hyaluronic acid) and repair agents strengthen the surface and can mitigate dryness and discomfort. These measures do not increase protection from UV rays but improve skin tolerability and response to topical care; avoid aggressive exfoliation shortly before intense exposures to avoid increasing photosensitivity. Correct sunscreen use remains central: uniform application, adequate quantity, and regular reapplication are essential practices [3].

Progressive exposure and attention to phototypes

Gradual sun exposure reduces the risk of erythema and allows skin cells to activate protective mechanisms (e.g., increased melanin). Regardless of skin color, short, controlled periods of exposure are preferable to intense and prolonged exposures. People with fair phototypes must be particularly cautious; in any case, the use of shade, protective clothing, sunglasses, and wide-brimmed hats complete the protection strategy. These simple rules reduce the risk of acute damage and the accumulation of chronic damage that leads to photoaging and pre-neoplastic lesions [1].

What diet can offer and when to consider supplements

Diet contributes to skin defense systemically. Lipophilic carotenoids (β-carotene, lycopene, lutein) and other antioxidants accumulate in the epidermis and dermis and modulate sensitivity to UV rays; for example, interventions with lycopene-rich foods (tomato paste) have shown a reduction in erythema in controlled studies, but it takes several weeks to accumulate effective skin concentrations [5]. Meta-analyses and reviews indicate that β-carotene supplementation can offer modest protection from erythema if taken at adequate doses and for prolonged periods, but the results are heterogeneous and do not replace topical protection [4]. Oral formulations combining different antioxidants tend to show more marked synergistic effects compared to single nutrients, albeit with variability between studies [3].

The specific role of carotenoids, antioxidants, and omega-3

Carotenoids and lycopene: mechanisms and limitations

Carotenoids can attenuate UV-induced redness through antioxidant action and partial absorption of light energy. Clinical studies have documented increases in erythema resistance after weeks of regular intake and appropriate doses; however, maximum protection is limited and takes time to manifest. Evidence suggests that the combination of carotenoids with other antioxidant molecules can amplify the protective effect, but consuming large doses uncontrollably is not advisable without supervision [4][5].

Omega-3: inflammation, repair, and skin health

ω-3 fatty acids (EPA, DHA) modulate inflammatory responses and promote resolution through pro-resolving mediators; this is relevant for the treatment of skin inflammation and wound healing. Recent reviews highlight potential benefits of ω-3 in reducing inflammatory markers and supporting reparative processes, but clinical evidence on aesthetic parameters (elasticity, hydration) is mixed and often depends on dose, duration, and context (e.g., chronic or post-surgical conditions) [7][8]. Supplementation can be considered as support in the presence of specific indications, under medical supervision [7].

Topical protection: sunscreens, spectrum, and methods of use

Primary protection remains the regular use of broad-spectrum sunscreens that shield against both UVA and UVB. Recent molecular evidence shows that applying an SPF 30 product before exposure attenuates transcriptional and epigenetic changes induced by UV rays and reduces signs of erythema even after repeated exposures; therefore, SPF 30 is considered effective as a daily protective measure for most people, remembering that the correct amount and reapplication every 2 hours (or after swimming/sweating) are crucial for the actual effect [9]. Sunscreens do not block 100% of radiation: the higher the SPF, the more the residual fraction is reduced, but the practical difference between SPF 30 and very high SPF is limited if the product is not applied correctly. Protective clothing and behaviors (seeking shade during peak hours) complete the preventive strategy [9].

Vitamin D: balance between necessity and safety

The skin synthesizes vitamin D3 in response to UVB; short and regular exposures are generally sufficient to maintain adequate levels in many individuals, but variability due to age, phototype, latitude, and adipose status can reduce synthesis. Classical literature documents the role of vitamin D in bone health, immune health, and various metabolic pathways; however, it is not advisable to seek vitamin D through intense or unprotected sun exposure due to the risks associated with UV rays. In cases of deficiency risk (e.g., limited exposure, obesity, certain clinical conditions), evaluation through blood tests and controlled supplementation are safer approaches [2].

PRACTICAL SECTION

What it means in practice

1) Primary protection: daily use of a broad-spectrum sunscreen (SPF ≥ 30) on exposed areas and regular reapplication, along with clothing and shade. [9]
2) Skin preparation: maintain a cleansing and moisturizing routine; exfoliate moderately a few weeks before holidays, avoiding aggressive treatments in the 72 hours prior to exposure.
3) Diet as support: a diet rich in colorful fruits and vegetables provides carotenoids and antioxidants. In people who desire additional support and have no contraindications, some supplements (carotenoids, antioxidant mixtures, omega-3) can reduce erythema sensitivity and modulate inflammation, but do not replace sunscreen. [3][4][5][7]
4) Vitamin D: evaluate levels with laboratory tests if deficiency is suspected; prefer controlled supplementation when indicated, rather than risky sun exposure. [2]
5) Medical consultation: in case of sensitive skin, use of photosensitizing drugs, or a history of skin cancer, consult a specialist before modifying exposure or starting supplements.

KEY POINTS TO REMEMBER

• Topical sun protection remains the most effective measure to reduce acute and chronic damage.
• Carotenoids and other dietary antioxidants can offer valuable systemic support but act slowly and only as a complement.
• Omega-3 modulate inflammation and repair, useful in selected contexts but do not prove a direct 'tanning agent'.
• Vitamin D is partly obtained from the sun, but supplementation is the safe strategy in case of confirmed deficiency.
• Choices must be personalized: phototype, medical history, and objectives influence the best options.

LIMITATIONS OF EVIDENCE

Many studies on diet and photoprotection are observational or small clinical studies; only a portion consists of large-scale randomized trials. Controlled studies show detectable but often moderate effects, dependent on dose, duration, and nutrient combination. Reviews highlight methodological heterogeneity, differences in outcome measures (MED, molecular parameters, clinical signs), and different implications depending on the context. Key difference: observational studies show associations (co-presence of antioxidant-rich diet and less damaged skin) but do not prove causality; clinical trials provide more robust evidence but are not always replicable. Interpreting results requires caution and attention to study design, studied population, and intervention duration [3][6].

Editorial conclusion

For a tan that is both aesthetic and health-conscious, the most robust strategy combines topical protection, prudent behavior, and a diet rich in antioxidant nutrients. Supplements can complement skin defenses in specific scenarios, but do not replace sun protection and good practices. Individual assessments and professional consultations remain the basis for safe and effective choices.

Editorial note

This article was originally published in the past and has been updated following scientific and informative criteria. The information is for informational purposes only and does not replace personalized medical advice. For clinical concerns, consult a healthcare professional.

SCIENTIFIC RESEARCH

1. Ultraviolet (UV) radiation and the skin: molecular basis and clinical implications. Int J Mol Sci. 2013;14(6):12222–12248. https://doi.org/10.3390/ijms140612222 [1]
2. Holick MF. Vitamin D deficiency. N Engl J Med. 2007;357(3):266–281. https://doi.org/10.1056/NEJMra070553 [2]
3. Parrado C, Philips N, Gilaberte Y, Juarranz A, González S. Oral Photoprotection: Effective Agents and Potential Candidates. Front Med (Lausanne). 2018;5:188. https://doi.org/10.3389/fmed.2018.00188 [3]
4. Meta-analysis: Protection from sunburn with beta-carotene. Photochem Photobiol. 2008;84(2):284–288. https://doi.org/10.1111/j.1751-1097.2007.00253.x [4]
5. Rizwan M, Rodriguez-Blanco I, Harbottle A, Birch-Machin MA. Tomato paste rich in lycopene protects against cutaneous photodamage in humans in vivo: a randomized controlled trial. Br J Dermatol. 2011;164(1):154–162. https://doi.org/10.1111/j.1365-2133.2010.10057.x [5]
6. Pandel R, Poljšak B, Godic A, Dahmane R. Skin photoaging and the role of antioxidants in its prevention. ISRN Dermatol. 2013;2013:930164. https://doi.org/10.1155/2013/930164 [6]
7. New insights on the effects of dietary omega-3 fatty acids on impaired skin healing in diabetes and chronic venous leg ulcers. Foods. 2021;10(10):2306. https://doi.org/10.3390/foods10102306 [7]
8. Specialized pro-resolving lipid mediators and dietary omega-3/6 fatty acids in selected inflammatory skin diseases: a systematic review. Antioxidants. 2025;15(1):9. https://doi.org/10.3390/antiox15010009 [8]
9. Sunscreen application substantially mitigates molecular perturbations induced by repetitive UV exposure and maintains healthy skin. Sci Rep. 2026; (Article). https://doi.org/10.1038/s41598-026-37232-4 [9]