Tag: Undigestible protein

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Can Humans Digest Fingernails? The Indigestible Truth About Keratin

Dec 17, 2025 •

4 min read

Approximately 20-30% of the population bites their nails, leading many to wonder: can humans digest fingernails? The short answer is no, because fingernails are made of a tough, fibrous protein called keratin that the human digestive system is not equipped to break down.