Whey Protein Isolate

Whey Protein Isolate: What It Is and How to Choose It

Whey protein isolate (WPI) is a form of whey that undergoes additional filtration compared with standard whey protein concentrate. This process generally results in a higher concentration of protein and lower amounts of carbohydrates, fat and lactose.

Whey isolate belongs to the wider family of whey protein products and is an option for people looking for a protein powder with a high percentage of protein and a nutritional profile that generally contains less fat and lactose than whey concentrate.

Whey Protein Isolate vs Concentrate: What's the Difference?

The main difference between whey protein isolate and concentrate lies in the processing method and resulting nutritional composition. Whey concentrates retain varying amounts of carbohydrates, fat and lactose, while whey protein isolate undergoes further filtration.

This generally results in:

• a higher percentage of protein;
• lower amounts of carbohydrates and fat;
• a reduced amount of lactose;
• often a higher cost per serving than whey concentrate.

This does not mean that whey isolate is automatically the best choice for everyone. The right option depends on individual nutritional requirements, tolerance, the composition of the specific product and budget.

For a more detailed comparison of the different whey formulations, read our Magazine guide to choosing the right whey protein powder, including the differences between whey concentrate and isolate.

How to Choose Whey Protein Isolate

When comparing whey protein isolates, check the nutrition label rather than relying only on the product name or marketing claims.

Useful factors to compare include:

• protein content per 100 g and per serving;
• overall protein percentage;
• carbohydrate, sugar and fat content;
• lactose content when declared;
• ingredients, flavourings and sweeteners;
• pack size and number of servings;
• cost per serving and overall value.

Whey Protein Isolate and Muscle Mass

Like other dietary protein sources, whey isolate provides protein that contributes to the growth and maintenance of muscle mass.

For physically active people, total daily protein intake remains an important consideration. Whey protein isolate can be consumed after training or at other times of the day when adding a convenient source of dietary protein is useful.

Whey Protein Isolate and Lactose

The additional filtration used to produce whey protein isolate generally reduces the amount of lactose compared with whey concentrate. However, the actual lactose content varies between products.

Anyone who needs to limit or avoid lactose should therefore check the ingredients, nutrition information and manufacturer's specifications rather than assuming that every whey protein isolate is lactose-free.

Whey Protein Isolate at Body Nutrition

Body Nutrition has been selling supplements online since 2001. In this category you can compare whey protein isolates from international brands, with different protein concentrations, ingredients, flavours, pack sizes and price points.

To compare other whey formulations, browse our Whey Protein category, or explore our complete selection of protein powders.