Here's what you need to know...
If you want the sleekest, most manageable and frizz-controlled hair of your life, there's only one word you need to know: Keratin.
Keratin is "the main protein of the hair, skin and nails", says Jez Barnett, founder of KeraStraight.
"Keratin makes up to 91 percent of hair and contains 16 ...
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