# What is Leucine?

> Leucine is an essential amino acid that acts as a key trigger for muscle protein synthesis, which is why protein powders are often compared by their leu...

- **URL**: https://www.best-proteinpowder.com/glossary/leucine/
- **Publisher**: [Best Protein Powder](https://www.best-proteinpowder.com/)

---

Leucine is an essential amino acid that acts as a key trigger for muscle protein synthesis, which is why protein powders are often compared by their leucine content.