Allergy Ingredient Checker
Scan or search any skincare, haircare, makeup, or household product. Patch checks the label against your known allergens and flags common sensitizers — so you can decide before you buy.
No credit card required · Not medical advice
Three steps to safer shopping
Patch turns a confusing ingredient list into a clear answer.
Search or scan
Type a product name, paste an ingredient list, or snap a photo of a label. Patch reads standard INCI names.
Match your allergens
Patch cross-references every ingredient with your personal allergen profile and flags matches instantly.
Spot sensitizers
Even when nothing matches your personal list, Patch highlights common contact sensitizers worth knowing about.
More than a simple text search
Patch understands aliases, cross-reactors, and common sensitizers.
Contact allergens
Patch knows over 150 patch-test allergens and their label aliases — from fragrance mix to methylisothiazolinone.
Common sensitizers
Flags ingredients like parabens, sulfates, formaldehyde releasers, and essential-oil terpenes even if they're not on your personal list.
Fragrance & masking agents
Catches 'parfum,' 'fragrance,' and related terpenes that often hide in 'unscented' or 'fragrance-free' products.
Cross-reactivity
Basic plans and above show cross-reactors — ingredients that may trigger a reaction if you're allergic to a related substance.
Learn about common culprits
Browse ingredient pages to see why dermatologists flag them and which products tend to hide them.
Frequently Asked Questions
An allergy ingredient checker compares the ingredients in a product against a list of allergens or sensitizers you already know. Patch lets you scan a barcode, photograph a label, or paste an ingredient list to see matches in seconds.
Create a free Patch account, add the allergens you know from a patch test or your own history, then scan or paste any product's ingredient list. Patch highlights matches and explains why each ingredient is flagged. Always re-check the physical label before buying.
Yes. Beyond your personal allergen list, Patch flags well-documented contact sensitizers and irritants such as fragrance, formaldehyde releasers, methylisothiazolinone, parabens, sulfates, and essential-oil terpenes so you can make an informed choice.
No. Patch is an informational tool built from public ingredient registries and academic allergen databases. It is not a substitute for a professional patch test, medical diagnosis, or consultation with a dermatologist.
Patch is an information tool, not a substitute for a dermatologist. If you suspect a contact allergy, ask your doctor about patch testing (e.g. the TRUE Test or an expanded series).
Stop reading labels alone
Join Patch and check any skincare or personal-care product against your allergens in seconds.