I used the treatment without knowing there was formaldehyde in it & I have terrible lung damage. All tests keep coming back fine but I know I have lung damage! I am 25 & very very upset. I'm not sure what my diagnosis will be yet but I am 99% it is from the hair treatments. Good luck to both of you & SHAME on these hair companies!!
I know that this treatment contains keratin and formaldehyde.
Formaldehyde use is STRICTLY controlled here in Europe; can be toxic, allergenic and carcinogenic. It is has been banned in some countries and has been linked to certain cancers. I can't say that was the cause of your sister's Thyroid CA.