The name of the protein found in hair is keratin, so the graphic variant keratin is not recommended.
Source: Fundéu RAE
In news related to health and beauty, it is not uncommon to find the inappropriate spelling of this voice, as in the following examples: “Keratin is a protein that our body generates and that makes up 80% of hair”, “Keratina It is not just a protein to control frizz” or “Keratin treatment is one of the most used in beauty salons”.
The academic dictionary defines keratin as ‘protein rich in sulfur, which constitutes the fundamental part of the outermost layers of the epidermis of vertebrates and its derivatives, such as feathers, hair, horns, nails, hooves, etc., to which they owe their resistance and hardness’.
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The only way collection of this voice since it was incorporated into that work in 1914 it is with the group whatnot with the letter kaand it is also the only one included in the Dictionary of medical terms of the Royal National Academy of Medicine. The shape keratin may be influenced by english keratin.
Therefore, in the previous examples, it would have been appropriate to write “Keratin is a protein that our body generates and that makes up 80% of the hair”, “Keratin is not only a protein to control frizz” and “The treatment of Keratin is one of the most used in beauty salons.
By extension, cosmetic treatments based on keratin are sometimes also called that. Although it is not being applied directly to the protein itself, it does not stop alluding to it, so it is still appropriate to write with what
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