Quick Answer
Protein derived from animal hair, feathers, or horns.
Detailed Explanation
What is it?
Keratin is a popular cosmetics.
Why it may be doubtful
Keratin in shampoos and treatments is usually derived from sheep wool, animal horns, or feathers. While some scholars permit it since hair/wool is pure, others advise caution if the animal source is unknown. Plant-based "phyto-keratin" is halal.
Fiqh considerations
There are varying scholarly opinions on some of the underlying ingredients, particularly depending on your madhhab.
Practical advice
Always read the latest ingredient label or use the allhalal.info scanner app, as manufacturers frequently change their recipes. Look for certified vegan or halal symbols where possible.
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