You slather on that $90 retinal every night and then slap on sunscreen in the morning — and somehow wonder why your skin isn’t glowing. The problem isn’t your serum. It’s your sunscreen’s pH.
Most sunscreens sit around pH 6-7. Your night actives need pH 4-5. That’s not a small gap — that’s a chemical chasm. Sioris My Morning Seal is the first sunscreen I’ve tested that actually bridges it.
SPF 50+ PA++++, $28 for 40ml. The claim that got me: “pH 5.5 formula that protects without disrupting your acid mantle.” Sounds like marketing fluff — until you realize it’s the pH that lets your night actives keep working into the next day.
pH 5.5 Formula
Your acids from last night aren’t instantly neutralized the second this touches your skin.
Centella + Mugwort Base
Calming ingredients that don’t just sit there — they actually reduce the redness your retinoids caused the night before.
No White Cast, No Grease
Dries down in about 40 seconds. Not 10, not 5 — 40. That’s the honest number.
Photo: Amanda Wolbert / Unsplash
This isn’t a “clean beauty” gimmick. The hero here is the pH system — they’ve formulated around 5.5, which is exactly where your skin’s natural buffering lives. Plus, you get actual skin-feeding ingredients, not just filters.
- Centella Asiatica: calms the irritation your night actives leave behind
- Mugwort Extract: anti-inflammatory that actually does something
- Niacinamide 2%: supports barrier repair while you’re in the sun
- Hyaluronic Acid: keeps moisture locked without making the SPF pill
Photo: ibnu ihza / Unsplash
First squeeze: watery, almost like a light emulsion. Rubs in clear in roughly 15 seconds, then there’s a weird 20-second window where it feels slightly tacky. Then — nothing. Like you put on nothing. That’s the moment I knew this was different.
Week two: my morning redness was down. Not dramatically — but noticeably. My vitamin C wasn’t pilling underneath anymore, which I assumed was my moisturizer’s fault. It wasn’t.
Photo: Eurico Craveiro / Unsplash
My skin’s morning tone evened out by about 30% — not a miracle, but real. My night serums actually feel like they’re working now. The sunscreen itself won’t transform your skin, but it stops undoing your night work.
Photo: Rosa Rafael / Unsplash
If you’re using active serums at night, this is the sunscreen you’ve been missing. It’s the only one I’ve found that doesn’t sabotage the work you did in the dark.