The Pros and Cons of SPF: Should You Wear Sunscreen Every Day?

Finding the Balance Between Healthy Sun Exposure and Skin Protection

If you've spent any time researching sunscreen, you've probably come away more confused than informed. One article says everyone should wear SPF every single day—even indoors. Another warns that sunscreen blocks vitamin D, contains questionable ingredients, and may do more harm than good. So, who's right?

As with many topics in medicine, the answer isn't as simple as "always" or "never." At IVY Integrative, we try to move beyond extremes and help patients understand how to make decisions that support their overall health. When it comes to sun exposure, our goal isn't to avoid the sun altogether—it's to enjoy its benefits while minimizing unnecessary skin damage.

Sunlight is one of the most powerful natural tools we have for supporting health. It helps our bodies produce vitamin D, which is essential for strong bones, immune function, and healthy mood. Exposure to natural light also regulates our circadian rhythm, helping us sleep better at night and feel more energized during the day. Research has even shown that sunlight stimulates the release of nitric oxide in the skin, which may play a role in supporting healthy blood pressure and cardiovascular health. In other words, the sun isn't something our bodies are designed to fear—it's something we evolved alongside.

Of course, like many good things, too much can become harmful. Repeated sunburns and excessive ultraviolet (UV) exposure increase the risk of premature skin aging and skin cancer. This is where sunscreen has an important role. Used appropriately, sunscreen helps reduce DNA damage caused by UV radiation and lowers the risk of developing precancerous skin lesions and certain forms of skin cancer. It can also help prevent wrinkles, age spots, and uneven pigmentation that develop after years of cumulative sun exposure.

That said, not every sunscreen is created equal. One of the biggest concerns in recent years has been the widespread use of chemical sunscreen ingredients such as oxybenzone, octinoxate, octocrylene, and homosalate. Studies have demonstrated that these ingredients can be absorbed into the bloodstream after repeated application. While absorption alone doesn't prove they're harmful, researchers continue to investigate their long-term effects. Some laboratory studies have suggested these chemicals may interfere with hormone signaling, although the evidence in humans remains inconclusive. For many people, especially those with sensitive skin, these products can also cause irritation, burning around the eyes, or allergic reactions.

This is one reason I generally recommend mineral sunscreens instead. Zinc oxide has an excellent safety profile and provides broad-spectrum protection against both UVA and UVB rays. Unlike most chemical sunscreens, zinc oxide primarily sits on the surface of the skin, where it helps reflect and absorb ultraviolet radiation before it can damage skin cells. It's also much less likely to cause irritation, making it an excellent option for children and individuals with eczema, rosacea, or sensitive skin.

One of the most common questions I hear is whether sunscreen causes vitamin D deficiency. In theory, sunscreen blocks UVB rays, which are necessary for vitamin D production in the skin. However, real life is much messier than laboratory conditions. Most people don't apply enough sunscreen or reapply it often enough to completely prevent vitamin D synthesis. In fact, studies have found that regular sunscreen users often maintain normal vitamin D levels because some UV light still reaches the skin. That said, people who spend nearly all of their time indoors, consistently avoid the sun, or live in northern climates are certainly at higher risk for vitamin D deficiency. Rather than relying on unprotected sun exposure to meet your vitamin D needs, I generally recommend checking blood levels when appropriate and supplementing if necessary.

Another area where I think we've lost some nuance is the recommendation to wear sunscreen every waking moment. While daily facial SPF can be helpful for individuals with a history of skin cancer, melasma, or significant sun exposure, I don't believe everyone needs to panic about walking to the mailbox without sunscreen. If you're heading outside for a quick morning walk, taking your dog out, or spending just a few minutes in gentle morning sunlight, those brief exposures are unlikely to cause meaningful skin damage. On the other hand, if you're planning to spend hours gardening, hiking, swimming, exercising outdoors, or relaxing at the beach, sunscreen becomes an important part of protecting your skin. The intensity of the UV index, the time of day, your skin type, and the length of your exposure all matter far more than following a rigid rule that sunscreen must always be worn.

Sunscreen also shouldn't be your only line of defense. Wearing a wide-brimmed hat, seeking shade during the hottest part of the day, choosing UPF-rated clothing when you'll be outdoors for extended periods, and simply avoiding sunburns are all incredibly effective ways to protect your skin. These strategies reduce UV exposure without requiring you to rely solely on sunscreen.

At the end of the day, I don't believe the healthiest approach is to fear the sun, nor do I think it's wise to ignore the very real risks of excessive UV exposure. Instead, I encourage patients to think about sunlight the same way we think about nutrition or exercise. The right amount supports health. Too little can be harmful, and too much can also have consequences.

My personal recommendation is simple: enjoy the sunshine, don't chase a sunburn, and when sunscreen is appropriate, choose a high-quality mineral sunscreen containing zinc oxide whenever possible. It's a balanced approach that protects your skin while still allowing you to benefit from one of nature's most important sources of health.

If you want a tailored treatment plan addressing your current skin health, past medical history, and comprehensive look at your topicals and supplements, schedule a FREE consultation with me today!

Until next time,

Author: Dr. Chelsea Birch, ND, RH (AHG), CBHT

References

1. Green AC, Williams GM, Logan V, Strutton GM. Reduced melanoma after regular sunscreen use: randomized trial follow-up. Journal of Clinical Oncology. 2011;29(3):257-263.

2. Young AR, Narbutt J, Harrison GI, et al. Optimal sunscreen use, during a sun holiday with a very high ultraviolet index, allows vitamin D synthesis without sunburn. British Journal of Dermatology. 2019;181(5):1052-1062.

3. Passeron T, Andersen PH, Katta R, et al. Sunscreen photoprotection and vitamin D status. British Journal of Dermatology. 2019;181(5):916-931.

4. Food and Drug Administration. Effect of Sunscreen Application Under Maximal Use Conditions on Plasma Concentration of Sunscreen Active Ingredients. JAMA. 2020;323(3):256-267.

5. Matta MK, Florian J, Zusterzeel R, et al. Effect of Sunscreen Application on Plasma Concentration of Sunscreen Active Ingredients. JAMA. 2019;321(21):2082-2091.

6. Holick MF. Vitamin D Deficiency. New England Journal of Medicine. 2007;357:266-281.

7. Holick MF, Binkley NC, Bischoff-Ferrari HA, et al. Evaluation, Treatment, and Prevention of Vitamin D Deficiency: An Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology & Metabolism. 2011;96(7):1911-1930.

8. World Health Organization. Ultraviolet Radiation and Human Health. WHO Fact Sheet.

9. American Academy of Dermatology Association. How to Select and Use Sunscreen.

10. D'Orazio J, Jarrett S, Amaro-Ortiz A, Scott T. UV Radiation and the Skin. International Journal of Molecular Sciences. 2013;14(6):12222-12248.

11. Narbutt J, Lesiak A, Skibińska M, et al. Repeated Sunscreen Application and Vitamin D Levels in Healthy Adults: A Review of the Evidence. Photodermatology, Photoimmunology & Photomedicine. 2020.

12. Wang SQ, Balagula Y, Osterwalder U. Photoprotection: A Review of the Current and Future Technologies. Dermatologic Therapy. 2010;23(1):31-47.

Disclaimer: This information is generalized and intended for educational purposes only. Due to potential individual contraindications, please see your primary care provider before implementing any strategies in these posts.