# What is Whey Protein Isolate (WPI)?

> Whey protein isolate is whey that has been filtered further than concentrate, reaching at least 90% protein by weight, with very little lactose or fat r...

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

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Whey protein isolate is whey that has been filtered further than concentrate, reaching at least 90% protein by weight, with very little lactose or fat remaining.