[{"data":1,"prerenderedAt":252},["ShallowReactive",2],{"ingredient-dimethylaminopropylamine":3},{"id":4,"title":5,"body":6,"category":208,"commonProducts":209,"description":213,"extension":214,"icon":215,"inciName":20,"irritantReason":216,"isCommonIrritant":217,"keyFacts":218,"localNames":228,"meta":229,"navigation":217,"path":230,"relatedArticles":231,"seo":238,"severity":239,"slug":240,"stem":241,"subtitle":242,"symptoms":243,"synonyms":248,"__hash__":251},"ingredients/learn/ingredients/dimethylaminopropylamine.md","Dimethylaminopropylamine (DMAPA)",{"type":7,"value":8,"toc":198},"minimark",[9,14,30,33,36,40,47,50,78,82,85,99,103,106,122,125,137,141,165,168,172],[10,11,13],"h2",{"id":12},"what-is-dimethylaminopropylamine-dmapa","What is Dimethylaminopropylamine (DMAPA)?",[15,16,17,21,22,25,26,29],"p",{},[18,19,20],"strong",{},"Dimethylaminopropylamine"," (INCI: Dimethylaminopropylamine; abbreviation: DMAPA; full chemical name: 3-Dimethylaminopropylamine) is a diamine intermediate used in the industrial synthesis of ",[18,23,24],{},"cocamidopropyl betaine (CAPB)"," — one of the most commonly used mild surfactants in shampoos, body washes, and liquid soaps. DMAPA itself is not an intended ingredient in finished products; it is a ",[18,27,28],{},"residual impurity"," that remains in CAPB after synthesis if manufacturing purification is incomplete.",[15,31,32],{},"The discovery that DMAPA (rather than CAPB itself) is the primary sensitizer responsible for most allergic reactions attributed to \"CAPB allergy\" was a significant finding in contact dermatology. It explains why different CAPB-containing products from different manufacturers cause reactions of varying severity — manufacturing quality and DMAPA removal efficiency determine how much residual DMAPA remains in the CAPB, and therefore how allergenic the ingredient is in a given product.",[15,34,35],{},"DMAPA is an ACDS-listed allergen and is routinely tested alongside CAPB in shampoo/hair product allergy patch test workups.",[10,37,39],{"id":38},"why-does-dmapa-cause-reactions","Why does DMAPA cause reactions?",[15,41,42,43,46],{},"DMAPA is a ",[18,44,45],{},"bifunctional amine"," with strong nucleophilic properties — its two amine groups readily react with electrophilic molecules in skin proteins to form hapten-protein conjugates. As a diamine, it is more reactive than monoamines, explaining its high sensitizing potential relative to its concentration.",[15,48,49],{},"The clinical manifestations of DMAPA/CAPB allergy include:",[51,52,53,60,66,72],"ul",{},[54,55,56,59],"li",{},[18,57,58],{},"Scalp dermatitis",": Shampoo contact causes scalp redness, scaling, and itch — often misdiagnosed as seborrheic dermatitis or dandruff",[54,61,62,65],{},[18,63,64],{},"Facial and eyelid dermatitis",": Shampoo rinse water contains DMAPA and flows over the face and eyelids during rinsing",[54,67,68,71],{},[18,69,70],{},"Hairdresser occupational dermatitis",": Professional hairdressers have chronic high exposure to shampoos, contributing to occupational hand and forearm dermatitis",[54,73,74,77],{},[18,75,76],{},"Hand dermatitis from liquid soap",": Many liquid handwashes contain CAPB with residual DMAPA",[10,79,81],{"id":80},"where-is-dmapa-found-in-products","Where is DMAPA found in products?",[15,83,84],{},"DMAPA itself is not intentionally added to finished products — it is found as a residual impurity in:",[51,86,87,93],{},[54,88,89,92],{},[18,90,91],{},"Cocamidopropyl Betaine (CAPB)",": Used in virtually all mild, \"sulfate-free\" shampoos and body washes",[54,94,95,98],{},[18,96,97],{},"Related amidopropyl betaine surfactants",": Other betaine surfactants made by similar synthesis routes",[10,100,102],{"id":101},"how-to-spot-dmapa-containing-products","How to spot DMAPA-containing products",[15,104,105],{},"Since DMAPA is an impurity, it is not listed on cosmetic ingredient labels. Instead:",[51,107,108,119],{},[54,109,110,111,114,115,118],{},"Check for ",[18,112,113],{},"Cocamidopropyl Betaine"," or ",[18,116,117],{},"CAPB"," in the ingredient list — these are the products that may contain DMAPA",[54,120,121],{},"When CAPB allergy is suspected, patch testing with both CAPB and DMAPA is needed to identify whether DMAPA is the sensitizer",[15,123,124],{},"Look for CAPB under these names on ingredient lists:",[51,126,127,131],{},[54,128,129],{},[18,130,113],{},[54,132,133,136],{},[18,134,135],{},"Coco-Betaine"," (different compound, but often grouped)",[10,138,140],{"id":139},"in-indian-products","In Indian products 🇮🇳",[15,142,143,144,147,148,147,151,154,155,147,158,147,161,164],{},"Cocamidopropyl betaine is extremely common in Indian shampoos, particularly in the expanding \"sulfate-free\" and \"gentle\" shampoo segment. Indian brands including ",[18,145,146],{},"WOW Apple Cider Vinegar Shampoo",", ",[18,149,150],{},"Mamaearth Onion Shampoo",[18,152,153],{},"Biotique"," sulfate-free ranges, and many others contain CAPB. International sulfate-free brands sold in India through Nykaa and Amazon — ",[18,156,157],{},"Dove Intense Repair",[18,159,160],{},"L'Oreal EverPure",[18,162,163],{},"Garnier Fructis"," gentle ranges — all use CAPB.",[15,166,167],{},"Indian consumers who experience scalp itch, flaking, or facial rash from \"gentle\" or \"sulfate-free\" shampoos that they expected to be less irritating than traditional SLS-containing shampoos may be reacting to DMAPA in the CAPB rather than to SLS.",[10,169,171],{"id":170},"safer-alternatives","Safer alternatives",[51,173,174,180,186,192],{},[54,175,176,179],{},[18,177,178],{},"Shampoos using different surfactant systems",": Sodium cocoyl isethionate (SCI), sodium lauroyl sarcosinate, or disodium cocoyl glutamate — none contain DMAPA",[54,181,182,185],{},[18,183,184],{},"True \"CAPB-free\" shampoos",": Vanicream Shampoo, Free & Clear Shampoo (specifically formulated for contact-sensitized patients)",[54,187,188,191],{},[18,189,190],{},"Solid shampoo bars",": Some bars use soap-based or sarcosinate surfactant systems without CAPB",[54,193,194,197],{},[18,195,196],{},"Simple baby shampoos",": Some formulate with sodium trideceth sulfate or other alternatives — check labels for CAPB absence",{"title":199,"searchDepth":200,"depth":200,"links":201},"",2,[202,203,204,205,206,207],{"id":12,"depth":200,"text":13},{"id":38,"depth":200,"text":39},{"id":80,"depth":200,"text":81},{"id":101,"depth":200,"text":102},{"id":139,"depth":200,"text":140},{"id":170,"depth":200,"text":171},"surfactant",[210,211,212],"Shampoo","Body wash","Liquid soap","DMAPA is the actual contact allergen responsible for most allergic reactions attributed to cocamidopropyl betaine (CAPB), a common shampoo surfactant. A significant ACDS-listed allergen in hair and body care products.","md","🫧",null,true,[219,222,225],{"label":220,"value":221},"CAPB impurity","DMAPA is a residual impurity from the synthesis of cocamidopropyl betaine (CAPB) — the actual sensitizer in most CAPB allergy cases",{"label":223,"value":224},"Manufacturing quality","Higher-purity CAPB manufacturing with better DMAPA removal produces less allergenic products; product batch variation affects allergenicity",{"label":226,"value":227},"ACDS listing","ACDS-listed as the primary sensitizer for what is clinically called \"CAPB allergy\" — testing both CAPB and DMAPA is recommended",[],{},"/learn/ingredients/dimethylaminopropylamine",[232,235],{"slug":233,"title":234},"/learn/reading-cosmetic-labels","How to Read Cosmetic Labels",{"slug":236,"title":237},"/learn/patch-test-results-now-what","Patch Test Results: Now What?",{"title":5,"description":213},"moderate","dimethylaminopropylamine","learn/ingredients/dimethylaminopropylamine","The hidden sensitizer behind cocamidopropyl betaine allergy in shampoos",[244,245,246,247],"Scalp dermatitis and dandruff-like flaking from shampoo allergy","Facial and neck dermatitis from shampoo rinse water","Eyelid dermatitis from shampoo contact","Hand dermatitis from liquid soap use",[249,250],"DMAPA","3-Dimethylaminopropylamine","osjxsz6ny88WE1Edo2P5HIc_WzlYsGPhxBy9ITXyswA",1778416676677]