Many people spend heavily trying to reverse wrinkles after the damage is done. It is far easier — and far more evidence-backed — to prevent that damage in the first place. Sunscreen is the most rigorously studied topical tool for protecting skin from visible aging. It is also inexpensive and widely accessible. That combination makes it arguably the most cost-effective skin intervention available.
There is a catch, however. Some of the very ingredients that protect skin from UV radiation raise their own safety questions. The uncertainty has led regulators in several major markets to request more data before confirming these ingredients as fully safe and effective.
Fortunately, a new generation of sunscreen compounds is resolving those concerns — and understanding the distinction between old and new formulas is what separates an effective sun-protection routine from one that may carry unintended risks.
Table of Contents
- Why Sunscreen Matters
- The Problems with Older Sunscreen Formulas
- Key Developments in Sunscreen Technology
- The Best Sunscreen and Regional Availability
- References
Why Sunscreen Matters
Sunscreen is, according to a substantial and consistent body of clinical evidence, the most effective topical intervention against visible skin aging. But unless the right formula is chosen — and applied correctly — it is possible to inadvertently cause harm or to significantly reduce the protection received.
How does sunscreen work against skin aging? In addition to visible light, the sun continuously emits ultraviolet (UV) radiation. UV radiation cannot be seen, but its effects certainly can. It breaks down collagen and elastin — the two structural proteins responsible for skin's firmness and elasticity — causing the skin to sag and develop wrinkles. UV radiation also damages cellular DNA and stimulates melanocytes (pigment cells), creating age spots and uneven skin tone. Taken together, these effects dramatically accelerate the visible aging of skin. UV exposure also substantially increases the risk of skin cancer.
Even before the underlying mechanisms were well understood, clinicians noticed that something in sunlight caused dermal damage as early as the 1800s. By 1889, researchers had identified UV radiation as the responsible agent. That discovery led directly to the development of the first chemical sunscreen in 1891, formulated by a physician in Germany.
Consistent sunscreen use blunts these UV effects. It acts as a protective barrier, guarding the structural integrity of skin from damage that accumulates over years and decades. The impact can be dramatic. A striking example is a photograph of a 92-year-old woman who used sunscreen on her face but not her neck for over 40 years — the difference in apparent skin aging between the two areas is remarkable and clearly illustrates the long-term protective effect [1].
A landmark 2013 randomised controlled trial enrolled 903 adults and assigned participants to either daily sunscreen use or their usual practice. After 4.5 years, the daily sunscreen group showed no detectable signs of new skin aging — a compelling demonstration of real-world efficacy [2].
A follow-up study published in 2016 extended these findings further: regular sunscreen use does not merely halt the progression of skin aging — it can actually reverse visible signs of existing photoaging in skin [3].
The evidence on skin cancer prevention is similarly encouraging. After reviewing the available data, the authors of a recent systematic review and meta-analysis concluded: "The highest-quality evidence available suggests that sunscreens do prevent skin cancer" [4].
A commonly raised objection is that sunscreen use has increased over the past two decades while skin cancer rates have simultaneously risen — leading some commentators to argue that sunscreen is ineffective or unnecessary [5]. The data, however, tells a considerably more nuanced story.
Reported sunscreen use in the U.S. has indeed climbed — from approximately 25% to 33% since 2000 [6]. And melanoma diagnoses have risen in the U.S., the U.K., Australia, and other countries [7].
Two key factors explain this pattern without undermining sunscreen's efficacy. First, when people feel protected by sunscreen, they tend to spend significantly more time outdoors — yet most people do not apply an adequate amount, which means effective UV exposure may actually be higher despite wearing sunscreen [7]. Second, populations in high-income countries are ageing, with a greater proportion of people now over 65 [8]. Skin cancers are disproportionately common in older age groups.
Data from the U.K. illustrates this clearly: peak melanoma diagnoses occur in people in their 70s [9]. The demographic shift in population age structure alone provides a plausible explanation for the rising cancer trend — without invoking any failure of sunscreen protection.
What is not in question: UV radiation is a primary and well-established driver of skin cancer, and sunscreens — when used properly and in adequate amounts — meaningfully reduce UV exposure. Claims that sunscreen provides no meaningful benefit should be treated with considerable scepticism given the weight of evidence supporting its effectiveness.
The evidence-backed conclusion is clear: the development and widespread adoption of sunscreens has been one of the most important advances in skin health over the past century.
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The Problems with Older Sunscreen Formulas
Sunscreen resolved the UV damage problem — but it may have introduced a different one. Understanding that tradeoff is essential for making informed choices about which sunscreen to use.
There are two main categories of sunscreen: mineral and chemical. Chemical sunscreens have been the dominant choice for decades because they often deliver stronger UV protection, are easier and more cosmetically elegant to apply, and are more water-resistant — making them practical for outdoor activities and swimming.
The downside became apparent as research progressed. Many active ingredients in chemical sunscreens are absorbed through the skin. A 2020 clinical study published in JAMA found that all six tested active chemical sunscreen ingredients were absorbed into the bloodstream at concentrations above the FDA's pre-existing safety thresholds [10].
That study does not demonstrate harm from these chemicals — it demonstrates absorption at levels exceeding the thresholds that were set before systematic safety testing on these compounds was conducted.
Whether this systemic absorption matters clinically remains genuinely unclear. A 2017 review article surveying numerous studies on the potential health impacts of these chemicals found evidence that some chemical sunscreen ingredients may be capable of disrupting hormones or contributing to developmental problems [11]. A more recent 2024 meta-analysis reached a similar conclusion, finding evidence that certain sunscreen chemicals can interfere with hormonal function [12].
The limitations of this evidence are significant and must be stated clearly. Almost all available studies on this question use animal or in vitro models rather than human subjects. Additionally, the doses employed in laboratory studies are typically far higher than those encountered under normal daily sunscreen use. As one researcher summarised: "Whether concentration resulted from daily use and/or environmental contact possesses a realistic hazard to humans and other organisms is still unknown" [11].
The area is scientifically contested. This genuine uncertainty led the U.S. FDA to formally request additional safety data on 12 common chemical sunscreen active ingredients before determining whether they can be classified as generally recognised as safe and effective [13]. Critically, requesting more data is not the same as declaring those ingredients unsafe. The authors of the 2020 JAMA absorption study were explicit: "These findings do not indicate that individuals should refrain from the use of sunscreen" [10]. The public health benefit of UV protection remains substantial even while further safety data is gathered.
So what about mineral sunscreens? The two most common mineral active ingredients — zinc oxide and titanium dioxide — work differently. Rather than being chemically absorbed into UV radiation, they physically reflect and scatter it. Critically, these compounds are not meaningfully absorbed through intact skin. This lack of systemic absorption led the authors of the 2024 meta-analysis to conclude that mineral sunscreens have the fewest potential adverse effects of any currently available formulation [12].
The practical tradeoff: mineral sunscreens can leave a noticeable white or hazy residue on the skin, particularly on darker skin tones. They also tend to be less water-resistant than chemical formulas, which can be a limitation for swimming and vigorous exercise.
Key Developments in Sunscreen Technology
Until recently, the practical choice seemed to be between chemical sunscreens with unresolved safety questions and mineral sunscreens that are cosmetically less appealing. Recent scientific advances are substantially changing this landscape for consumers who have access to next-generation formulas.
On the chemical side, researchers have developed new UV-filter compounds that are meaningfully superior to traditional options in both safety profile and performance. One of the most recent is phenylene bis-diphenyltriazine (TriAsorB). This chemical has two key properties that set it apart: it absorbs UV radiation across a wide spectrum covering both UV-A and UV-B, and it forms relatively large molecular particle sizes. Large particle size yields very low penetration through the skin barrier [14], making any significant systemic absorption unlikely under normal use conditions.
Bemotrizinol is another broad-spectrum next-generation filter that has been found to have limited skin absorption [15]. This compound has been in use in European and Australian sunscreens for many years and has accumulated an extensive safety record during that time.
Other examples of next-generation chemical filters include Ethylhexyl Triazone (marketed as Uvinul T 150) [16] and Tris-Biphenyl Triazine (marketed as Tinosorb A2B) [17]. Each has been developed with improved safety and performance characteristics compared to the older generation of UV-filter chemicals.
Compared to older chemical UV filters, these newer-generation compounds represent a substantial improvement across multiple dimensions: much lower skin absorption rates reducing systemic exposure, broader UV-A and UV-B coverage providing more complete protection, and greater photostability meaning the filters maintain their protective effect reliably when exposed to sunlight rather than breaking down over the course of a day.
Mineral sunscreen technology has also advanced significantly. Traditional mineral formulations used very large particle sizes of zinc oxide and titanium dioxide. The large particle size was beneficial in that the minerals were too large to be absorbed through the skin — but the cosmetic downside was a pronounced white or chalky film that many users found unacceptable, particularly on darker skin tones.
Newer nanoparticle mineral formulations have substantially reduced the particle size of these mineral filters. The result is a far less noticeable residue, easier and more uniform application, and in some cases enhanced UV protection due to improved light-scattering properties.
The natural concern with nanoparticle minerals: if particle sizes have been reduced dramatically, is there now a meaningful risk of absorption through the skin? A clinical trial examining zinc oxide nanoparticles specifically in a sunscreen application concluded that systemic absorption remains very low [18]. The nanoparticles are still too large to cross the intact skin barrier in meaningful amounts.
One important caveat applies to spray sunscreen formats. When nanoparticle-containing sunscreens are used in aerosol form, the fine airborne particles can potentially be inhaled and enter the body through the respiratory tract — a route bypassing the skin barrier entirely. For this reason, some expert scientific bodies have specifically recommended against the use of nanoparticle formulations in sprayable sunscreen products, while considering them appropriate in creams and lotions [19].
The Best Sunscreen and Regional Availability
With next-generation UV filters available, the path forward seems clear: avoid older chemical sunscreens and use the newer, safer formulas instead. The complication is that access to these better options depends significantly on where in the world a person lives.
The European Union and Australia have been proactive in their regulatory approach, approving newer chemical sunscreen active ingredients with improved safety profiles. Many other major markets lag considerably behind. In the U.S., the FDA has not added any new sunscreen active ingredient to the approved list since 1999 — a striking regulatory gap of more than 25 years. This means that the next-generation UV filters widely available in Europe and Australia are not legally permitted in U.S.-market sunscreens.
For consumers in markets without access to next-generation filters, the best available approach is to select a sunscreen meeting two essential criteria: broad-spectrum protection (covering both UV-A and UV-B radiation) and a sun protection factor (SPF) of at least 50 for maximum UV attenuation.
CeraVe 100% Mineral Sunscreen SPF 50 is one product that meets these criteria for U.S. consumers. It contains both titanium dioxide and zinc oxide as its active ingredients, includes none of the 12 ingredients flagged by the FDA for further safety review, and is widely available at approximately $5.59/oz [20].
In New Zealand, Australia, and parts of Europe — where regulatory approval extends to newer chemical filters — sunscreens using next-generation UV filters such as bemotrizinol are readily available. Four well-regarded Korean brands that meet the broad-spectrum SPF 50+ criteria and use next-generation chemical filters (with no affiliation) include:
- Beauty of Joseon: Relief Sun Aqua-Fresh: Rice + B5 SPF50+ Broad Spectrum [21]
- Round Lab: Birch Juice Moisturising Sunscreen SPF50+ Broad Spectrum [22]
- Skin1004: Madagascar Centella Hyalu-Cica Water Fit Sun Serum SPF50+ Broad Spectrum [23]
- Haruharu Wonder: Black Rice Moisture Airyfit Daily Sunscreen SPF50+ Broad Spectrum [24]
For those without access to the Korean or European next-generation formulas, a mineral sunscreen such as CeraVe SPF 50 remains a well-supported alternative. The white film it leaves is a minor cosmetic tradeoff compared to the risks of using a daily product containing ingredients that have not yet been fully characterised for long-term safety.
Two additional hazards are worth understanding. Scientists have detected harmful chemicals — specifically benzene and benzophenone — in some commercially available sunscreens. These do not appear on product labels because they are not intentionally added; they can form as byproducts during manufacturing or accumulate as the product ages over time. In 2021, benzene contamination was detected in numerous sunscreens and after-sun products. The FDA has stated that no level of benzene is acceptable in these products.
Separately, researchers have found that benzophenone — a substance classified as a mutagen, carcinogen, and hormone disruptor — can form when octocrylene, one of the 12 FDA-flagged chemical sunscreen ingredients, breaks down [25]. Octocrylene is found in a significant proportion of commercially available sunscreens, and it is possible that all products containing octocrylene may generate benzophenone over their shelf life.
ConsumerLab.com publishes independent testing results on sunscreens and maintains a curated list of mineral-based broad-spectrum sunscreens that are likely to be lower risk based on their formulation and testing results. They have no affiliation with this content, but their resources are a useful reference for consumers seeking evidence-based product guidance.
There is also reason for optimism regarding access to safer options for U.S. consumers. Bemotrizinol is currently under FDA review for approval as a new sunscreen active ingredient. It has been in widespread use in Europe and Australia for many years and has accumulated substantial safety testing data [26]. Regulatory approval in the U.S. market is anticipated in the near term [27], which would substantially expand the options available to American consumers.
Finally, application volume is a frequently overlooked factor that dramatically affects real-world efficacy. The SPF values printed on product packaging are measured using an application of 2 mg per cm² of skin — equivalent to roughly a full shot glass of product for the entire body. Research consistently shows that most people apply half or less of this amount in practice, which sharply reduces the effective level of protection received [28]. The standard recommendation is to reapply every two hours, and more frequently when swimming or exercising, to maintain the labelled SPF value throughout the day.
References
1. https://onlinelibrary.wiley.com/doi/full/10.1111/jdv.17660
2. https://pubmed.ncbi.nlm.nih.gov/23732711/
3. https://pubmed.ncbi.nlm.nih.gov/27749441/
4. https://pmc.ncbi.nlm.nih.gov/articles/PMC7759112/
6. https://www.ncbi.nlm.nih.gov/books/NBK587264/
7. https://pmc.ncbi.nlm.nih.gov/articles/PMC10741796/
8. https://www.npr.org/2011/09/24/140736119/as-europe-ages-its-economies-look-vulnerable
10. https://jamanetwork.com/journals/jama/fullarticle/2759002
11. https://pmc.ncbi.nlm.nih.gov/articles/PMC5615097/
12. https://pmc.ncbi.nlm.nih.gov/articles/PMC11022667/
14. https://link.springer.com/article/10.1007/s43630-023-00453-x
15. https://www.sciencedirect.com/science/article/pii/S0273230023000120
16. https://en.wikipedia.org/wiki/Ethylhexyl_triazone
17. https://en.wikipedia.org/wiki/Tris-biphenyl_triazine
19. https://pubmed.ncbi.nlm.nih.gov/31588611/
20. https://www.cerave.com/sunscreen/face/hydrating-mineral-sunscreen-face-lotion-spf-50
22. https://hikoco.co.nz/products/birch-juice-moisturising-sunscreen-spf50-pa
23. https://hikoco.co.nz/products/madagascar-centella-hyalu-cica-water-fit-sun-serum-spf50-pa
24. https://hikoco.co.nz/products/black-rice-moisture-airyfit-daily-sunscreen-spf50-broad-spectrum
25. https://pubmed.ncbi.nlm.nih.gov/33682414/
26. https://dermnetnz.org/topics/allergy-to-bemotrizinol
27. https://www.usatoday.com/story/news/health/2024/05/17/fda-behind-sunscreen-skin-cancer/73672619007/
