Published on: July 21, 2026
Toward year-round prevention of pigmentation, collagen loss, inflammation, and accelerated skin aging
A patient came in last month, sunscreen loyalist, SPF 50 every single day, and she was frustrated. “I do everything right,” she said, “so why do I have more brown spots than my sister, who barely wears sunscreen at all?”
I often get versions of this question. And the honest answer is that “wearing sunscreen” and “protecting your skin” are not automatically the same thing. Most of us were taught that sun protection has one job: prevent sunburn. Check the SPF number, reapply if you’re at the beach, done. That framework isn’t wrong, exactly. It’s just decades out of date.
The research on what ultraviolet and visible light actually do to skin has moved a long way past “burning = bad, no burning = fine.” We now understand that pigmentation, collagen breakdown, and low-grade inflammation happen continuously, in every season, with or without a sunburn, and that an SPF number tells you almost nothing about your protection against any of them. This is reshaping how physicians think about sun protection, and it’s part of why you’re starting to see a real split in sunscreen offerings: products that just block UVB, and products designed to do a great deal more.
SPF (sun protection factor) is a UVB metric. It tells you how much longer it takes UVB rays to redden your skin compared to no protection at all. That’s it. It says nothing about UVA protection, nothing about visible light, and nothing about infrared radiation — all of which reach your skin every day you’re outside, clouds or no clouds, sunburn or no sunburn.
This matters because UVA, not UVB, is the primary driver of photoaging. UVA penetrates more deeply into the dermis, where it generates reactive oxygen species that degrade existing collagen and suppress the fibroblasts responsible for making new collagen. It does this at intensities far too low to cause any burning or even a noticeable tan. You can have a high SPF number, feel perfectly “protected,” and still be accumulating meaningful collagen damage and sun spots every time you drive to work, sit near a window, or walk the dog. UVA is remarkably consistent across the year and largely unaffected by clouds, which is the entire basis for “sunscreen every day, not just summer.”
Visible light — particularly the blue-violet end of the spectrum, from both sun and screens — has its own separate problem: it’s a significant driver of pigmentation, especially in medium-to-deeper skin tones. This is a big part of why patients doing everything “right” by SPF standards still develop sun spots and hyperpigmentation (like melasma) that keeps recurring. Standard chemical and mineral filters do a mediocre job against visible light. Iron oxide–containing tinted formulas do meaningfully better, which is one reason I like tinted sunscreen for anyone dealing with pigmentation issues.
And then there’s the inflammation piece. UV exposure — even at low, sub-sunburn doses — triggers a cascade of inflammatory mediators in the skin: cytokines, matrix metalloproteinases (the enzymes that chew up collagen), and oxidative stress that compounds over time. This is now understood as a major contributor to what researchers call “inflammaging” — the chronic, low-level inflammatory state that accelerates visible skin aging independent of any single sunburn event. It’s cumulative, it’s silent, and an SPF number was never designed to address it.
This is why we’ve started talking to patients about sunscreen in two categories, because they are functionally different products even when they sit next to each other on a shelf.
The difference isn’t marketing fluff. A sunscreen that pairs broad-spectrum UV filtration with antioxidants is doing measurably more to prevent the collagen loss and pigmentation your SPF number was never tracking in the first place. If you’re someone dealing with melasma, early fine lines, or a family history of visible sun damage, which category you’re using matters as much as the number on the front of the bottle.
Two products I bring up often in consults illustrate this well. Senté’s Even Tone Mineral Sunscreen is built around the company’s patented Heparan Sulfate Analog (HSA) technology — a lab-modified version of a molecule your skin already uses to repair damage, hydrate, and stimulate collagen production, engineered to actually penetrate skin instead of sitting on the surface the way the natural molecule does. It’s mineral, broad-spectrum, and doing real reparative work underneath the sun protection, not just sitting there as an SPF vehicle.
SkinMedica’s Total Defense + Repair goes a different route: its SOL-IR Advanced Antioxidant Complex packs in ten antioxidants, including niacinamide and CoQ10 (ubiquinone), and — notably — it’s formulated to address infrared radiation (IR-A) as well as UVA and UVB. Infrared doesn’t get talked about nearly enough, but it penetrates even deeper than UVA and contributes to the same collagen-degrading, inflammatory pathways. Neither of these products is doing “just SPF.” Both are doing the second job I described above, with a different ingredient strategy.
This year brought the most significant change to U.S. sunscreen regulation in a generation. The FDA approved bemotrizinol, the first new active sunscreen ingredient permitted in an over-the-counter U.S. product in roughly 25 years.
Bemotrizinol isn’t actually new — it’s been sold in Europe and Asia since 1999 under names like Tinosorb S, and it’s been a mainstay of European sun care for a long time. What’s new is that American formulators can finally use it. It offers broad, highly photostable UVA and UVB coverage, meaning it doesn’t break down in strong sun the way avobenzone (currently the only meaningful UVA filter approved in the U.S.) tends to. Because it directly addresses the UVA gap I described above, it’s a genuinely useful addition to the anti-aging conversation, not just the sunburn-prevention one.
Products containing bemotrizinol are expected to start reaching U.S. shelves later this year, as manufacturers reformulate. Bemotrizinol is not proprietary; the base ingredient is a generic molecule. However, the European company DSM-Firmenich holds an 18-month exclusive marketing right in the US for their version, sold as Parsol Shield. All US sunscreen companies can access the ingredient by buying it from DSM-Firmenich. After the exclusivity period, other suppliers will be able to sell it to manufacturers. When they do, I’d expect to see it show up first in the multi-tasking category — paired with antioxidants and barrier-supportive ingredients — rather than in bare-bones SPF-only products, simply because the brands investing in better UVA filtration tend to be the same ones thinking about the whole picture.
Look past the SPF number. Check for “broad spectrum” on the label at minimum, and look at the actual ingredient list for antioxidants (vitamin C, E, ferulic acid), niacinamide, or peptides if collagen support and pigmentation prevention matter to you — which, if you’re reading this, they probably do. Reapplication matters less if you’re indoors most of the day, but daily application matters regardless of weather or season, because UVA and inflammatory aging don’t take days off.
SPF was designed to answer one question — will I burn — and it still answers that question well. But burning was never the only thing sun exposure does to your skin. Pigmentation, collagen breakdown, and chronic low-grade inflammation happen year-round, indoors and out, with or without a sunburn, and they are the real drivers of the aging most patients actually come to see me about.
The shift underway in sun protection — better UVA filters like bemotrizinol, smarter multi-ingredient formulas, and a move away from “SPF number” as the only metric that matters — reflects a more accurate understanding of what’s actually happening to your skin every day. Choosing a sunscreen that does more than block a burn is one of the highest-leverage things you can do for how your skin looks in ten years.
If you’d like help figuring out what your skin actually needs — whether that’s the right daily sunscreen, a plan for existing pigmentation, or a broader look at how sun damage fits into your skin’s aging picture — we’d be glad to talk it through. Book a consultation at Glow Medispa and we’ll take it from there.
