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 different amino ...
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