Protein form

Whey Protein

Last reviewed September 28, 2026Part of Protein
In short

A dairy protein from the liquid part of milk left after cheesemaking. Sold as concentrate (some lactose and fat) or isolate (more filtered, higher protein percentage).

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At a glance

Source
General reference
Milk (dairy)
Amino acids
Published research
Complete protein; relatively high in leucine
Dietary
General reference
Not vegan; isolate is lower in lactose

About whey protein

Whey is one of the most common protein powder bases. Isolate is filtered further than concentrate, so it’s usually higher in protein per gram and lower in lactose.

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Whey vs Plant Protein

Amino acids, dietary fit and cost per 20 g protein.

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Whey Protein products

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Shopping for whey Protein?

Before you buy, check the label for the form and amount per serving, look for a USP, NSF or Informed Choice seal, and compare cost per serving rather than bottle price.

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Other protein forms

Plant Protein

Sources & references

  1. Jäger R, Kerksick CM, Campbell BI, et al. (2017). International Society of Sports Nutrition position stand: protein and exercise. Journal of the International Society of Sports Nutrition 14:20. pubmed.ncbi.nlm.nih.govPosition stand

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This page is educational and is not medical advice. Talk to a healthcare professional before starting a supplement, especially if you have a medical condition, take medications, or are pregnant or breastfeeding.