{"slug":"cross-reactor-map","title":"The Cross-Reactor Map","tagline":"Allergic to one ingredient? See the relatives that may trigger you too.","description":"A reference map of cosmetic allergen families that cross-react: if you’re positive to one, these are the cousins to watch — with why they’re linked and what to look for on labels.","pages":9,"what_it_is":"Your immune system recognises a chemical shape, not a brand name — so a reaction to one allergen can mean a reaction to its relatives. This map lays out the families that cross-react, the reason each is linked (a near-identical molecule, a shared component, frequent co-sensitisation, or one releasing another), and what it means when you’re reading a label. It’s the companion to a patch-test result: one positive often rules out a whole family.","who_its_for":"Patch-test patients turning a result into a real avoidance list, and anyone confused why an unrelated-looking product still caused a reaction.","whats_inside":["The major allergen families and their cross-reactors","Why each pair is linked (structural, co-sensitisation, releaser…)","A plain note on what it means for label-reading","Turns one patch-test positive into a fuller watchlist"],"how_to_use":["Find the allergen you’re positive to as a family heading.","Note the relatives listed beneath it — those are your cross-reactors.","Read the “why” so you know how strong the link is.","Add the family to your watchlist, not just the single ingredient."],"faq":[{"question":"If I react to one, will I definitely react to all its cross-reactors?","answer":"Not necessarily. Cross-reactions vary between people — this map shows the associations seen in patch-test literature, so you know what to watch and discuss with your dermatologist."},{"question":"Where does the data come from?","answer":"It’s summarised from contact-dermatitis and patch-test references. It’s educational, not a diagnosis."},{"question":"Is it free?","answer":"Yes. Enter your email and the PDF downloads immediately."}],"page_url":"https://allernote.com/resources/cross-reactor-map","file_url":"https://allernote.com/downloads/cross-reactor-map.pdf","download_url":"https://allernote.com/api/resources/cross-reactor-map/download?email={email}","usage":"GET the download_url with the user’s email substituted for {email} to record the lead and receive the PDF (HTTP 302). Append &format=json for a JSON link."}