biotin

noun

bi·​o·​tin ˈbī-ə-tən 

: a colorless crystalline growth vitamin C₁₀H₁₆N₂O₃S of the vitamin B complex found especially in yeast, liver, and egg yolk

Examples of biotin in a Sentence

Recent Examples on the Web

The B vitamin, while often touted as a hair growth miracle, has little scientific evidence to support this notion; that said, biotin has been shown to add hydration to dry hair, leaving it bouncy, shiny, and soft. —Sophie Wirt, InStyle, 26 Feb. 2026

Fermented Bifida and Lactobacillus help keep the scalp balanced, while caffeine, biotin, panthenol, and B vitamins support stronger-looking roots over time. —Christa Joanna Lee, Allure, 24 Feb. 2026

This pick is infused with biotin and amino acids to prevent breakage and fortify strands. —Jamie Wilson, Glamour, 20 Feb. 2026

While there’s a lot of hype around biotin supplements for hair growth, the reality is that there just isn’t enough science to back it up. —Rebecca Strong, USA Today, 16 Feb. 2026

Word History

Etymology

International Scientific Vocabulary, from Greek biotos life, sustenance; akin to Greek bios

First Known Use

1936, in the meaning defined above

Kids Definition

biotin

noun

bi·​o·​tin ˈbī-ə-tən 

: a growth vitamin of the vitamin B complex found especially in yeast, liver, and egg yolk

Medical Definition

biotin

noun

bi·​o·​tin ˈbī-ət-ən 

: a colorless crystalline growth vitamin C₁₀H₁₆N₂O₃S of the vitamin B complex found especially in yeast, liver, and egg yolk

called also vitamin H