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Not medical advice. Label photos are read on your device and never uploaded.
Paste an ingredient list or scan a label. Add more products to check a routine.
Product data comes from Open Beauty Facts, an open database. Not every product is listed, and lists can be out of date. Missing a product? Add it to Open Beauty Facts
Add a second product to check a routine. Conflicts are checked across all products.
Routine check
Up to four products at once. Most conflicts happen between products, not inside one.
Popular ingredients from the knowledge base, what they do, and which flags they can trigger.
skin conditioning
An over-the-counter retinoid (vitamin A). Can cause dryness, peeling and sun sensitivity, especially when starting; usually used at night.
2 sources
exfoliant (AHA)
An alpha hydroxy acid (AHA) that loosens dead skin cells. Can sting or irritate and increases sun sensitivity.
2 sources
exfoliant (BHA)
A beta hydroxy acid (BHA) that exfoliates inside pores. Often used for acne; can be drying.
1 source
antioxidant
Pure vitamin C (L-ascorbic acid). An antioxidant that is unstable and breaks down with air and light, so it is usually formulated at low pH with stabilizers.
2 sources
Every pairing the checker looks for, straight from its rules file. These are cautions, not bans: ingredient lists don't show amounts, and some products combine these on purpose.
Use carefully
Retinoids and exfoliating acids (AHAs, BHAs, PHAs) can each cause dryness, peeling and irritation. Using them together can add up, especially when you are new to either one.
What people often do: Many people introduce one at a time, or use them on different nights. If you are unsure, ask a dermatologist before combining them.
Use carefully
Both retinoids and benzoyl peroxide can make skin more sensitive, dry or peeling, so using both may increase irritation. Some prescription products combine adapalene with benzoyl peroxide on purpose, so this is a reason to go slowly, not a ban.
What people often do: Follow the directions on the products or from your prescriber. If you are combining them yourself, start slowly and watch for irritation.
Use carefully
In a lab study, tretinoin mixed with a benzoyl peroxide lotion broke down quickly under light, while adapalene stayed stable. Applying them at the same time may make the tretinoin less effective.
What people often do: Ask your prescriber how to time these. A common approach is to use them at different times of day.
Good to know
Benzoyl peroxide is an oxidizing agent, and pure vitamin C (L-ascorbic acid) is unstable and breaks down when it oxidizes. Applying them at the same time may make the vitamin C less effective. This flag comes from the chemistry of the two ingredients, not from a clinical study of the pair.
What people often do: A cautious option is to use them at different times of day, for example vitamin C in the morning.
Use carefully
Benzoyl peroxide can make skin more sensitive or peel, and exfoliating while using it may make dryness worse.
What people often do: Consider using them on different days or at different times, and cut back if your skin gets irritated.
Good to know
Several exfoliating acids together can mean more exfoliation overall. FDA notes that the more serious reactions reported to it happen most often with the most exfoliating products.
What people often do: Products are often formulated with several acids on purpose. If you also use other exfoliants in your routine, watch for stinging, redness or peeling.
Talk about your results with other skincare fans. Be kind, and remember nobody here is your dermatologist.
A small, hand-checked knowledge base: 150 ingredients, 13 rules and 17 sources. Rules decide every flag; the optional AI summary can only reword them.
Paste an ingredient list, or scan a label photo. Text recognition runs in your browser, so the photo never leaves your device. You can fix any misread words before checking.
Each name is matched to its official INCI name, a common alias, or a close spelling (clearly labeled), then explained in plain language.
Curated rules check for common conflicts and irritants across all your products. Every flag links to the sources behind it.
No. It explains ingredients and points out general cautions from public sources. It can't tell how a product will affect your skin. For skin conditions, pregnancy, allergies or prescription products, talk to a dermatologist or pharmacist.
No. Text recognition runs in your browser, so the photo stays on your device. Only the ingredient text is sent to the server to be checked, and nothing is stored.
Ingredient lists don't include percentages. Ingredients above 1% are listed from most to least, so the checker notes when an active sits near the end of a long list. That's a hint, not a measurement.
It's shown as "not checked" instead of guessed. The knowledge base is intentionally small and cited, and it covers common skincare ingredients.
Yes. Add up to four products. Conflicts are checked across all of them, and each flag says whether the pairing is inside one product or between products.
It's optional and only appears when the site owner adds an API key. It rewrites the curated findings in a friendlier tone and isn't allowed to add new claims. The checker works fully without it.
The site itself is translated, but the ingredient explanations and safety flags are health information, so they stay in English until a native speaker has reviewed each translation.
Disclaimer. This tool explains ingredients using a small curated, cited knowledge base. It is not medical advice and cannot tell you how a product will affect your skin. Ingredient lists do not show amounts, so flags are general cautions. For skin conditions, pregnancy, allergies or prescription products, talk to a dermatologist or pharmacist.