Whey Isolate Vs. Whey Concentrate | Nutritionist Explains The Difference

When you first get into health and fitness, there’s no doubt you’ll come across protein powder (I mean, you are reading an article on There are loads of different types — clear, casein, vegan, soy — but the powerhouse of the protein world is definitely whey protein.

But whey comes in two forms — whey concentrate and whey isolate. Both will help you to build muscle, but what are the differences between them?

Fortunately, Myprotein product developer and nutritionist Katie Brown is here to demystify the details so you know which of the two is best for you.

What is whey?

Whey is a major component of cow’s milk and rich in protein. We extract the best bits to make whey protein. Here’s a better explanation from Katie.

“Whey protein is one of the major components of cow’s milk, accounting for about 20% of its protein content. When using milk to make cheese, the liquid that separates out from the curds during the process is the whey.”

But how does that liquid turn into a power? Well, we simply filter, evaporate and spray dry the liquid to turn it into a product customers can use.

Whey protein also contains all nine essential amino acids. They’re essential because we need them for our bodies to function, but we must get them from food sources as we can’t make them ourselves. This is what makes whey protein a complete protein. Its strong amino acid profile helps fuel muscle protein synthesis, the process of muscles growing and repairing.


Whey concentrate vs. whey isolate

This is where things can get confusing. Whey protein comes in two forms — concentrate and isolate. A customer favourite, Impact Whey Protein is whey concentrate. It’s made by pushing liquid whey through a filter and drying it.

Whey isolate goes through a process called crossflow microfiltration, which Katie says is a “more rigorous filtration process which causes the protein to separate from fat and lactose”.

As well as differences in the filtration process, they also have slightly different nutritional contents.


Whey concentrate has an 80% protein content, whereas whey isolate has a slightly higher protein content of 90% due to the additional filtering.


Whey isolate also has a lower fat content thanks to its filtration process, making it ideal for anyone looking to decrease the fat in their diet.


Because of whey isolate’s more rigorous filtration process, which separates the fat and lactose from the protein, whey isolate is more suitable for those with lactose intolerance.

Katie says the absorption rate of whey isolate and whey concentrate are pretty much the same, so you’ll reap muscle-building benefits from both.


Should I choose whey isolate?

Whey isolate is ideal for anyone wanting a high quality protein with a low fat and calorie content. However, due to the additional processing needed to make whey isolate, it’s slightly pricier than concentrate.


Should I choose whey concentrate?

If you’re looking for a quick and easy way to up your daily protein intake, whey concentrate is a great choice. It has a slightly higher fat content than isolate, but it’s still 80% protein and slightly cheaper.


Take home message

Both whey isolate and whey concentrate are great choices when it comes to protein. Both provide upwards of 20g of protein per serving, come in loads of delicious flavours and contain all nine essential amino acids. The key differences are in the protein, fat and lactose contents. So have a think about what’s important for your goals, and we’ll deliver you the protein.

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Our articles should be used for informational and educational purposes only and are not intended to be taken as medical advice. If you’re concerned, consult a health professional before taking dietary supplements or introducing any major changes to your diet.

Monica Green

Monica Green

Writer and expert

Originally from South London, Monica graduated from the University of Leeds with a degree in Philosophy. After discovering a love for the gym whilst studying, Monica was drawn to weight training which helped her hugely through stressful times as a student. From writing for a popular student site, Monica developed her skills as an author, writing trending feature pieces regularly. She is thrilled to be able to combine her love for writing with her passion for the gym. In her spare time Monica loves to cook, try out new restaurants with friends and explore new walking trails.

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