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Cysteine hair relaxers, perms ?
How does it work?
I find it hard to believe that just adding an amino acid (cysteine) can have such an effect on hair.
Do other ingredients make it work?https://www.cosmeticsandtoiletries.com/formulating/category/haircare/231624001.html
https://www.wacker.com/cms/en/industries/consumer_care/personal_care/hair_care/perm/perm.jsp
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