Scientific Reality
Documented findings from global health institutions.
2x
NIH Sister Study
Clinically proven links between chemical straighteners and health complications.
1 in 12
EWG Toxicity Ratio
Hazardous ingredients specifically marketed to women of colour.
60%
Absorption Rate
The rate at which topical toxins bypass the liver via the scalp and skin.
The Libraries
Everything we know about your hair and your skin, in one place.
Curl Patterns, Porosity & Scalp Health
From 3A to 4C and every hybrid in between — the science behind your curl pattern, how to test your porosity, and which oils actually work for your scalp.
Skin Type, PIH & the Fitzpatrick Scale
Why melanin-rich skin scars, darkens and heals differently — and exactly which ingredients help with acne, dark marks, uneven tone and eczema.
Where to Start
Four ways to use this hub.
Find Your Type
Identify your curl pattern, porosity, or skin type in the Libraries.
02Check an Ingredient
Look up what's in your products in the Toxic Beauty Database.
03Read the Research
See the studies behind every claim on this site, sourced and linked.
04Report a Product
Found something dangerous? Tell us and help protect someone else.
Scan, Quiz & Track — Your Way
The full experience scans a product label instantly, quizzes you into your exact hair and skin profile, and connects you to a community tracking the same ingredients you are.
Crown ID & Dermal Guard
Two dedicated Android apps, on their way as a direct download.
Join the WaitlistThe Web Scanner
iPhone doesn't allow apps to be installed outside its App Store, so Crown ID and Dermal Guard can't be distributed there the way they are on Android. This web scanner exists specifically to give iPhone users that same core feature, free, in Safari.
Open the ScannerI am Esther Ntinyari Mutembei. My path toward cosmetic science was sparked by a single article in the Daily Nation.
I had never heard of endocrine disruptors nevertheless their effect on womens health,and it really pained me how many women in my community had no clue about toxic substances they were putting on their hair and skin.
I made it my goal to enlight women all over the world especially women of colour whose products were most likely to contain this toxic substances.
I built this hub and the apps not only to teach women about toxic substances but on how to take care of their hair and the best and safest products for it.