All of which is to say, the texture is what got me first, a signal that the pH is where it should be. And I’m not the only one who noticed. “I am a longtime user of mineral sunscreen, and I have never experienced anything like this,” says Shanna Shipin, senior commerce director. “This is such an elegant formula that is so lightweight, it performs like a chemical sunscreen—I can hardly believe that there are mineral blockers in it.”
Sun Serum is fluid and serum-y, though not quite as runny as the Skin Tint Ilia fans know well. It glides on and blends without resistance—blindfold me, and I’d never guess it was sunscreen.
On the skin-care front, Ilia focuses on lightweight but deep hydration. Hyaluronic acid (seven molecular weights, to be exact) is doing the bulk of the heavy lifting here—Backman notes it’s “primarily for hydration, but secondarily, it improves skin smoothness, film support and texture enhancement,” helping counter that dry feel mineral sunscreens can leave behind. The formula’s sugars add another layer by boosting moisture and supporting the skin barrier, while coneflower (echinacea) and arctic root extracts help regulate oil, so you’re not trading dryness for midday shine.
Importantly, none of this seems to compromise the formula’s stability. Because yes, adding humectants and plant extracts can interfere with zinc oxide if you’re not careful. “They can, especially if they shift pH or introduce electrolytes that destabilize the dispersion,” Backman says. “Well-formulated systems are structured to keep zinc oxide evenly distributed and stable.”
This, it seems, is one of those formulas that actually gets that mix right—at least from where I’m sitting. On my dry, sensitive skin, it felt impressively hydrating. It melted in seamlessly without catching on the flaky spots around my cheeks and nose, leaving everything looking more plump than parched. In this unpredictable transitional weather we’re experiencing on the East Coast right now, that feels like a minor miracle.
