Doctor, I’ve stopped using sunscreen. My neighbour said it blocks vitamin D, and my blood test already shows I’m deficient.”
This is one of the most common misconceptions I encounter in my clinic. Patients who have diligently used sunscreen for years suddenly abandon it after hearing that it might be responsible for low vitamin D levels. Some stop using it altogether, despite struggling with melasma, acne marks, or sun sensitivity.
After 15 years in dermatology, I’ve learned that myths often survive because they contain a grain of scientific truth. The idea that sunscreen causes vitamin D deficiency sounds perfectly logical—until you examine the evidence.
Vitamin D is indeed produced when ultraviolet B (UVB) rays from sunlight interact with the skin. Sunscreens are designed to reduce UVB penetration. Therefore, many people conclude that sunscreen must prevent vitamin D production.
The science tells a far more nuanced story.
In laboratory settings, when sunscreen is applied exactly as recommended—at a thickness of 2 mg/cm² over every exposed area—it can significantly reduce UVB exposure. But real life bears little resemblance to laboratory conditions.
Most people apply far less than the recommended amount, often only a quarter to half of what is required. They miss areas such as the ears, eyelids, neck and hands. Many forget to reapply every two hours, and inevitably lose protection through sweating, rubbing, or washing. Even those who use sunscreen daily receive incidental sun exposure while walking outdoors, driving, exercising, or simply moving between buildings.
As a result, enough ultraviolet radiation usually reaches the skin to permit vitamin D synthesis.
This is precisely why numerous clinical studies have failed to demonstrate that regular sunscreen use leads to clinically significant vitamin D deficiency in everyday life.
If sunscreen were truly the primary culprit, populations that use it consistently should have widespread deficiency. That isn’t what research has found.
UV rays cause visible damage
Ironically, India—despite receiving abundant sunshine throughout the year—has one of the highest rates of vitamin D deficiency globally. Clearly, sunscreen alone cannot explain the deficiency.
Modern lifestyles keep us indoors for most of the day. Many commute in covered vehicles, work in offices, spend leisure time inside shopping malls or gyms, and return home after sunset. Air pollution filters ultraviolet rays, while clothing covers much of the body. In addition, darker skin—which is common among Indians—contains more melanin and naturally requires longer sun exposure to produce equivalent amounts of vitamin D.
Ageing, obesity, certain gastrointestinal disorders, chronic kidney disease, and some medications can also contribute to deficiency. When I evaluate patients with low vitamin D levels, sunscreen is rarely the determining factor.
Yet, the myth persists. And it has another unintended consequence.
Many people deliberately skip sunscreen during peak sunlight hours in the hope of improving their vitamin D levels. In doing so, they expose themselves to the very ultraviolet radiation responsible for premature skin ageing, pigmentation, collagen breakdown, and an increased lifetime risk of skin cancer.
Every week I treat patients whose melasma has worsened after “getting some vitamin D”, or whose anti-ageing treatments have been undone by repeated unprotected sun exposure.
The damage caused by excessive ultraviolet exposure is both visible and cumulative. Fine lines, wrinkles, uneven pigmentation, leathery skin, and persistent sunspots are not the result of one afternoon outdoors but of years of preventable ultraviolet injury.
Also read: Your collagen is in the kitchen. And it’s better than the best anti-ageing skincare routine
The right way to deal with vitamin D deficiency
Fortunately, protecting your skin and maintaining healthy vitamin D levels are not mutually exclusive.
For most healthy individuals, brief incidental outdoor exposure during daily activities is often sufficient to contribute to vitamin D production. Walking outdoors, gardening or spending a short period outside with parts of the arms or legs uncovered can all help, depending on skin type, season, latitude, and pollution levels.
There is no universal prescription as every individual synthesises vitamin D differently.
However, if blood tests confirm deficiency, the most reliable and safest solution is not to abandon sunscreen. It is to correct the deficiency through appropriate dietary intake and medically supervised supplementation.
Foods such as fatty fish, fortified dairy products, egg yolks, and fortified cereals provide some vitamin D, although supplementation is frequently necessary for individuals with established deficiency.
When patients ask me for the most effective anti-ageing skincare product, they usually expect an expensive serum or the latest aesthetic procedure. Instead, my answer is always sunscreen.
Daily use of sunscreen remains one of the few interventions consistently proven to reduce photoageing, pigmentation, sunburn, and cumulative ultraviolet damage. It also preserves the benefits of treatments such as lasers, chemical peels, and prescription skincare.
Science rarely deals in absolutes, and neither should we.
Yes, ultraviolet B rays are essential for vitamin D synthesis. Yes, sunscreen reduces UVB exposure under ideal laboratory conditions. But translating those facts into the sweeping claim that “sunscreen causes vitamin D deficiency” ignores decades of real-world clinical evidence.
So the next time someone advises you to skip sunscreen for the sake of vitamin D, remember that health is not a choice between one ‘treatment’ and another. It is about understanding the evidence, rejecting simplistic myths and making decisions that protect both your skin and your overall well-being.
Dr Deepali Bhardwaj is a Consultant Dermatologist, Max Hospital, Saket. She is also an anti-allergy specialist, laser surgeon and internationally trained aesthetician. She tweets @dermatdoc. Views are personal.
(Edited by Prasanna Bachchhav)