By: Matthew Kayser
A growing number of viral social media posts claim that sunscreen is toxic, causes cancer, or isn’t necessary at all. Dermatologists say those claims aren’t just misleading; they could discourage one of the most effective tools for preventing skin cancer.
Skin cancer is the most common cancer in the United States, and 1 in 5 Americans will develop it in their lifetime. Most of those melanoma cases are linked to ultraviolet (UV) exposure, according to the American Academy of Dermatology. The risk also builds with exposure: experiencing five or more blistering sunburns between ages 15 and 20 raises melanoma risk by 80% and nonmelanoma skin cancer risk by 68%.
Research supports that regular sunscreen use can meaningfully reduce that risk, which makes the volume of misinformation now competing with decades of established science all the more concerning.
The Myths That Concern Dermatologists Most
The claim that sunscreen ingredients are harmful to human health is among the most widely shared, and most thoroughly refuted, pieces of skin care misinformation circulating today. Many of these claims rely on isolated studies taken out of context or misunderstandings about how sunscreen ingredients are regulated and tested.
“You Can Tan Safely”
One myth gaining traction online, particularly among younger audiences, is the idea that tanning can be done safely by monitoring the UV Index. Dr. Alexandra Theriault, MD, FAAD, a board-certified dermatologist at Apex Dermatology in Denver, Colorado, directly pushes back on that. “I am seeing an increasing number of teenagers and young adults who follow the UV Index to ‘safely’ tan their skin,” she says. “Any sun exposure that leads to pinkening or tanning of the skin can lead to an increased risk of skin cancer and premature aging of the skin.”
Dr. Theriault sees the misinformation problem as much an opportunity as a frustration. “I enjoy having an open dialogue with patients, presenting evidence-based recommendations on how they can protect themselves and be proactive about skin health,” she says.
“Sunscreen Is Toxic”
Dr. Jenifer D. Holman, MD, FAAD, a board-certified dermatologist and dermatologic micrographic surgeon at the Center for Aesthetic and Laser Medicine in Tyler, Texas, has personally battled skin cancer and has heard this one before.
“As a dermatologist, I try to practice evidence-based medicine and rely on evidence; current evidence does not show that any sunscreen ingredients available in the U.S. are harmful to human health,” Dr. Holman says. She also points to federal oversight as a meaningful layer of assurance. “One of the FDA’s responsibilities is to review the efficacy, safety, and quality of sunscreens. This means their standards for the sunscreens you can buy in the U.S. are very high.”
For patients who still prefer to err on the side of caution, mineral formulations containing zinc oxide or titanium dioxide are explicitly noted as noncarcinogenic by the FDA and are considered a sound alternative to chemical filters.
“Sunscreen Blocks Vitamin D”
A third claim circulating widely online is that daily sunscreen use blocks vitamin D absorption to a harmful degree. The science here has recently become more nuanced. A 2025 clinical trial known as the Sun-D Trial found that consistent sunscreen use may be associated with a small but clinically significant decrease in vitamin D levels, a finding the dermatology community takes seriously.
Even so, the recommendation from most dermatologists has not shifted: protect your skin, and supplement with vitamin D through diet or oral supplementation if needed. The American Academy of Dermatology does not recommend seeking vitamin D through unprotected sun exposure, noting there is no level of UV exposure that maximizes vitamin D synthesis without also increasing skin cancer risk.
What Actually Works
For those who remain concerned about sunscreen ingredients, mineral formulations containing zinc oxide or titanium dioxide are another effective option. Dermatologists emphasize that both mineral and FDA-approved chemical sunscreens are considered safe when used as directed, making them a sound option for anyone with lingering concerns about chemical filters.
But for Dr. Holman, the most important quality a sunscreen can have is simpler than that. “I always tell patients the best sunscreen is the one you will use,” she says. “Fortunately, many sunscreens also have beauty benefits. There are sunscreens that treat acne and rosacea, that hydrate the skin, that come in tinted or shimmering formulations.”
The Skin Cancer Foundation recommends a broad-spectrum, water-resistant sunscreen with at least SPF 30, applied to all skin not covered by clothing and reapplied every two hours during outdoor activity. Pairing sunscreen with protective clothing and shade during peak afternoon hours covers most of what daily UV exposure throws at unprotected skin.
Routine skin checks round out a complete approach to skin health. As Dr. Theriault puts it, “early diagnosis of a skin cancer is associated with better cosmetic outcomes and may be life-saving.” Scheduling an annual visit with a board-certified dermatologist remains one of the most straightforward and underused tools available.
Despite what viral videos may suggest, decades of clinical research continue to show that regular sunscreen use helps reduce the risk of skin cancer and premature skin aging. Social media trends come and go, but the evidence behind daily sun protection has remained remarkably consistent.
Disclaimer: This content is for informational purposes only and is not intended as medical advice, nor does it replace professional medical expertise or treatment. If you have any concerns or questions about your health, always consult with a physician or other healthcare professional.
