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Q&A Keratin biosynthesis and human hair straightness/smoothness

If ... Keratin ... can make human hair straighter, is it biologically sensical ... that ... Keratin supplements ... could make ... hair straighter? No. Hair is already made of keratin. People wi...

posted 3y ago by Olin Lathrop‭

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#1: Initial revision by user avatar Olin Lathrop‭ · 2021-03-23T14:23:09Z (over 3 years ago) 
<blockquote>If ... Keratin ... can make human hair straighter, is it biologically sensical ... that ... Keratin supplements ... could make ... hair straighter?</blockquote>

No.  Hair is already made of keratin.  People with curly hair don't have a keratin deficiency.  How straight or curled hair is depends on how exactly that keratin is produced and the fibers arranged relative to each other.  This is done by the hair follicles, which can have considerable genetic variation between people.