So apparently Amazon was not happy with my initial review and wouldn't post it. The only thing I can imagine is they did not like I had posted non Amazon links to information on 2 of the ingredients that concern me, phenoxyethanol and Cocamidopropyl hydroxysultaine. Ergo here my revised review:
I randomly developed white flakes in my hair and after trying a few things this was the only thing that worked. It didn't 100% eliminate my flakes but it greatly reduced them. Unfortunately when I purchased this I had been up all night trying to find a safe, non toxic solution and did not properly vet all the ingredients.
I have come to discover that phenoxyethanol is not a great ingredient. According to the website "Campaign for Safe Cosmetics" (safecosmetics.org) it can cause skin allergies, nervous system issues in infants (a nipple cream containing phenoxyethanol was found to harm breastfeeding infants) and should be kept away from small children. A cosmetic company called Follain has banished the ingredient form their products as they no longer consider it "clean beauty" (search "Follain" and "phenoxyethanol" for articles).
I find it concerning that a dandruff/cradle cap shampoo marketed towards children would contain an ingredient that may be harmful to them, and encourage everyone to research themselves before using this on a child let alone yourself. For those of you who have already used it and your child had a bad reaction as I see some have, see if any other products you use on them contain phenoxyethanol and if not that may be the culprit.
As for the Cocamidopropyl hydroxysultaine; there doesn't seem to be a lot of information on it which concerns me as someone who practices the precautionary principal. I am not a chemist but I do find it interesting Cocamidopropyl hydroxysultaine shares the same first word as Cocamidopropyl betaine, which I've learned is more processed than Coco-betaine due to the "amidopropoyl" part of the name. It's possible we will learn from further research that Cocamidopropyl hydroxysultaine is ok, but in the meantime I prefer to avoid this ingredient and go for less processed, better researched ones.
So while this product worked for me (luckily I bought it for myself, not a child) I will not be repurchasing until they change these ingredients, and encourage everyone to do their own research before buying or using this on yourself or children.
Website Sources: I am not allowed to post direct links per Amazon policy but here are the website names. Search these + the ingredient and you should easily find the same info I did. phenoxyethanol : Campaign for Safe Cosmetics, Clean Beauty 101 Cocamidopropyl: hydroxysultaine I Read Labels for You, Lisa Bronner's Blog (briefly touches on Cocamidopropyl as in Cocamidopropyl betaine but still may be relevant. Search "Lisa Bronner+ SLS actually and it's in the comments).