How to use it
Three steps to a risk read
Grab the ingredient list
Copy it straight from the packaging or the brand's product page.Paste it into the box above
Commas or line breaks both work — no need to tidy it first.Check the drivers, not just the verdict
The risk badge is a summary; the ingredients listed underneath show exactly what caused it.
Method
How this checker works
Comedogenic ratings run 0–5 on the Fulton scale, originally measured on rabbit ears with neat ingredients — not finished formulas. That's why a raw rating on its own is misleading: coconut oil at 40% behaves nothing like coconut oil as the last item on a list.
So we weight every rated ingredient by its INCI position, since lists are ordered by concentration down to 1%. An ingredient rated 5 near the top drives the risk; the same ingredient at position 30 barely moves it. We surface the drivers rated 3 or above so you can see exactly what caused the call.
Limits
What a rating can't tell you
- Concentration is invisible. Below 1%, INCI order is arbitrary, so a scary-looking ingredient may be present in a trace amount.
- Formulation changes behaviour. Fatty acids bound into an emulsifier system don't act like the free oil.
- Skin is individual. Plenty of acne-prone people wear a "4" with no problem, and break out from a "0". Patch-test rather than banning ingredients outright.
Common questions
Acne-safe ingredient checker FAQ
Is this an acne safe checker? It checks one specific risk: comedogenicity, meaning ingredients associated with blocked pores and closed comedones. Irritation, fragrance sensitivity and hormonal acne aren't visible in an ingredient list.
What does a comedogenic rating of 0–5 mean? It comes from old rabbit-ear assays: 0 is non-comedogenic, 5 is highly comedogenic. It's a rough signal for a raw ingredient, not a verdict on a finished formula, where concentration and the rest of the base matter more.
My bumps are itchy and all the same size — is that pore clogging? That pattern usually points to malassezia (fungal acne) rather than comedones. Run the same list through the fungal acne checker — it flags a completely different ingredient set.
Should I avoid every flagged ingredient? No. Position matters: coconut oil at #2 is a real risk, the same ingredient at #25 is usually a trace. Use the flags to shortlist suspects, then patch test.
Free tools & guides
No sign-up.
- ToolIngredient decoderPaste an INCI list and see what each ingredient actually does.
- ToolFungal acne checkerSpot the ingredients malassezia yeast can feed on.
- ToolPregnancy ingredient checkerScreen a formula for ingredients commonly avoided in pregnancy.
- GuideSPF guideDose, reapplication and what the number on the bottle means.
Early access
Want this for whole products?
Skinparency rates finished formulas — pore-clogging risk, texture, sting, whitecast and price reality, all in one verdict.
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