You're using a retinol serum at night. Your new moisturiser has AHAs. Your salon just did a glycolic peel. Is any of this a problem?
You Google it. One blog says never mix retinol and AHAs. Another says it's fine if you buffer. A TikTok dermatologist says it depends on your skin barrier. None of them know what you're actually putting on your face, in what order, at what concentration.
This is the skincare information gap: everyone gives general rules, but nobody checks your specific routine.
The real danger isn't one product — it's the stack
Individual products are tested for safety. But nobody tests your specific combination. A vitamin C serum is fine. A niacinamide moisturiser is fine. Layering them at the wrong pH can flush your face red for hours.
Multiply that across 6–8 products — morning and evening — and add salon treatments on top, and you've got a chemical cocktail that nobody is monitoring.
A 21-year-old was recently using SPF50 as a night sealant over active serums — every night. Her skin barrier was compromised and nobody in her routine had the full picture to flag it. That's not unusual. It's the norm.
What an ingredient conflict checker should do
A useful conflict checker isn't just a lookup table of "don't mix X with Y." It should:
Every product, morning and evening — not a one-off check but a living map of what's on your skin
Retinol + AHA, vitamin C + benzoyl peroxide, niacinamide + low-pH acids — the combinations that cause real damage
How much exfoliation and active stress your skin is under in total — not just per product
A glycolic peel changes what you should use at home for the next 72 hours
A Fitzpatrick Type VI skin reacts differently to actives than Type II — generic advice doesn't cut it
How SAY-OS does this
The SAY-OS Skincare Routine Tracker logs every product in your routine and maps the active ingredients. It flags known conflicts, calculates your barrier load index, and connects to your Beauty Passport — so your salon can see what you're using at home before they add another active treatment on top.
It also includes a Fitzpatrick skin type questionnaire so recommendations are personalised to your skin, not generic advice from a blog.
No more Googling "can I use retinol with..." at midnight.
Know what's on your skin — and what clashes
SAY-OS maps your full routine, flags conflicts, and shares the picture with your salon. Free for clients.
Get Free Early Access