Last updated: August 12, 2021

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Welcome to our big Whey Isolate Test 2022. Here we present all the Whey Isolates that we have tested in detail. We have compiled detailed background information and added a summary of customer reviews on the internet.

We would like to make your purchase decision easier and help you find the best Whey Isolate for you.

You will also find answers to frequently asked questions in our guide. If available, we also offer interesting test videos. Furthermore, you will also find some important information on this page that you should be aware of if you want to buy Whey Isolate.


  • Whey isolate is isolated protein from whey. Whey isolate has a high protein content and the highest biological value. This measures how well the protein can be converted into the body's own protein and is 140 for Whey Isolate with about 45% essential amino acids - compared to only 100 for chicken egg.
  • With Whey Isolate you can on the one hand specifically stimulate the muscle metabolism and build up muscle mass faster and on the other hand burn body fat and strengthen the immune system. It is available as a powder and is taken diluted with liquid.
  • In principle, Whey Isolate is more complex to produce than Whey Concentrate and tastes better than Whey Hydrolysate. The decisive advantage of Whey Isolate, however, is that it is purer, richer in protein and almost lactose-free, but it is also somewhat more expensive.

The Best Whey Isolate: Our Picks

Guide: Questions you should ask yourself before buying Whey Isolate

What is Whey Isolate?

Whey isolate is pure protein powder made from whey. It is called isolate because the protein has been isolated from the rest of the nutrients.

Whey isolate is considered a popular food supplement and substitute. Whey is the English term for whey and whey protein means whey protein.

Whey Isolate is ideal for meeting increased protein requirements. (Image source: / Bruno Glätsch)

Since small amounts of fat, carbohydrates and sugar remain when whey protein concentrate is extracted, the concentrate is filtered until pure Whey Isolate remains, which consists of 90-96 % high-quality protein.

All nine essential amino acids are found in whey protein. You take in these vital amino acids through food, as your body cannot produce them itself.

Three of them are valine, leucine and isoleucine. These three branched-chain amino acids (BCAAS) are abundant in Whey Isolate and promote muscle growth.

What does Whey Isolate do?

Whey isolate is the purest form of nutritional supplement and it is hard to imagine weight training without it. Whey isolate is traditionally used in weight training to build and maintain muscle.

In the areas of strength and body shape, or body fat, people who supplement Whey protein can demonstrably achieve greater training success. (1)

The increased protein consumption during intensive training phases can be effectively compensated with Whey Isolate. Nutrition also plays a very important role in muscle building. You can read more here:

Whey isolate promotes the formation of new proteins in the cells of all types of tissue, such as muscles, organs and skin, and accelerates the metabolism.

In the regeneration phase, your body uses protein to repair the smallest injuries caused by training and at the same time build up more tissue.

Whether for endurance sports or strength training, whey isolate is an excellent way to improve performance. (Image source: / 5132824)

But there is much more to Whey Isolate! The valuable amino acids are used in many areas, the most well-known of which are listed below:

  • Whey isolate protects your cells from free radicals. These cause oxidative stress and increase the risk of many diseases.
  • Whey Isolate is used for digestive health, cancer prevention, high blood pressure and osteoporosis treatment. (2)
  • Whey isolate acts as an antioxidant to counteract cell ageing and can slow down muscle breakdown in old age. (3)
  • Whey Isolate creates a feeling of satiety on the one hand and supports fat loss on the other, as it contains hardly any fat, carbohydrates and sugar.
  • Some Whey Isolates even boost the immune system as they contain substances such as beta-lacto-globulin, alpha-lacalbuimine, immunoglobulins and glycomacropeptides.

Who is Whey Isolate suitable for?

Basically, anyone can take Whey Isolate - it is especially suitable for people who train regularly, want to build up more lean muscle mass and burn body fat at the same time.

Whey isolate is also ideal for vegetarians and older people, as factors such as age and dietary style favour a protein deficit.

Sufficient protein is also important during growth. Some manufacturers point out that their powder is not suitable for pregnant women, children and adolescents.

The fact is that almost every household has a packet of white sugar and a bottle of pure oil in the kitchen; both macronutrients that have been extracted. However, pure protein, also extracted as a macronutrient, sounds controversial to many.

Erroneous assumptions that protein powder makes you fat or that protein metabolism produces too much ammonia and urea and overloads the kidneys are still circulating.

What is certain is that intact kidneys in both children and adults are not damaged by the consumption of protein powder.

If you have an increased protein requirement and healthy kidneys, you can take Whey Isolate without hesitation. It is important that you take the protein powder with liquid so that breakdown products can be excreted.

How is Whey Isolate made?

Whey isolate is made from whey, which is a liquid by-product of cheese and quark production. Whey generally has a very low protein content of less than 1%.

Through the ion exchange process or the microfiltration process, liquid, fat and carbohydrates such as lactose are almost completely removed from the whey protein, so that only the isolated whey protein remains. It is preserved by pulverisation.

Manufacturing process Processes
Ion exchange process In the ion exchange process, a chemical process, chemicals are used and the pH value is changed so that the whey protein binds to other substances. The charge of the protein molecules is changed for a short time so that the protein can be separated from components such as fat and carbohydrates. However, this has the disadvantage that valuable compounds such as lactoferrin and many of the immunoglobulins are lost and the process can reduce the biological value.
Microfiltration In contrast, microfiltration is a natural separation of the protein components from carbohydrates and fats. The raw whey is forced through a membrane with different pore sizes. Since proteins are larger than other components, they get stuck. Then the liquid is removed by evaporation and spray drying until the whey protein remains as a powder.
Cross-flow microfiltration (CFM) In cross-flow microfiltration, the process of microfiltration is slowed down, resulting in an even more precise separation of the components. Cross-flow microfiltration is called this because the whey flows through tangentially (i.e. crosswise). All contents that are larger than the pores of the membrane are retained. The end product is therefore an even purer protein with up to 95% protein content and very low lactose and fat content.

As long as the protein is not heated during the manufacturing process, it is of higher quality. If whey protein is heated above 80 °C, it is no longer as digestible because the molecular structure changes.

Depending on the flavour, flavours and sweeteners are added to Whey Isolate at the end.

How do I take Whey Isolate?

Whey Isolate is always taken with liquid. You can take Whey Isolate either every morning or after every workout. At these times your body is very receptive to protein.

Water is so beneficial for the absorption of Whey Isolate because it is digested immediately and is therefore quickly absorbed and utilised.

For other foods or drinks, your body needs a little longer to digest. However, some prefer the taste of ingestion with milk or other liquid foods such as yoghurt.

What are the benefits of Whey Isolate?

Whey Isolate is quickly absorbed into the body.

The special thing about whey protein is that the amino acids are absorbed directly into the muscle tissue instead of being metabolised in the liver like other proteins.

This gives your body immediate energy to build lean muscle mass, transport oxygen and fight off disease.

Whey isolate supports muscle fibre hypertrophy.

When a training stimulus is given and the body is supplied with sufficient protein, the muscles adapt and increase muscle fibre hypertrophy.

Your muscle fibres gain volume through the storage of muscle protein and rapid regeneration is possible.

Whey isolate can be easily converted into the body's own protein structures.

Whey protein has the advantage that its composition is similar to that of body proteins and can therefore be converted into the body's own protein.

This efficiency is called biological value and allows a classification of different proteins.

The protein in hen's egg is considered the reference value with a biological value of 100. The biological value of whey protein can be as high as 140.

Protein source biological value
Whey isolate 104-140
Whole chicken egg 100
Soya 84-86
Pork 85
Low-fat quark 81
Casein (milk protein) 77

What are the side effects or dangers of Whey Isolate?

Some people have a basic scepticism when they hear terms like isolate or food supplements. However, high-quality Whey Isolate is nothing more than filtered protein and the fear is therefore completely unfounded.

Whey protein is basically safe to take as long as you stick to the recommended dosage and take the powder with enough liquid.

We will also explain in a moment what the rumour about kidney damage caused by Whey powder is all about. Healthy kidneys tolerate protein powder perfectly.

Only those who do not adhere to the recommended intake and consume extremely high amounts of protein (400 g daily) over a longer period of time will sooner or later have to reckon with harmful side effects.

Risk groups include people with kidney disease, although this also only affects a small group of kidney patients. Here, a high protein intake can cause the disease to progress more quickly, as the kidneys have to work harder to excrete end products of protein metabolism.

In such cases, it makes sense to seek advice from a doctor or nutritionist. The vast majority, including people with mild kidney disease, can tolerate protein well.

One study examined the cases of 5 teenagers who developed acne after taking whey protein. There is already a basic connection between the consumption of dairy products and acne, but it is not clear which component of milk is responsible for this. (4)

The dangers of some protein powders are additional ingredients, such as the cell-damaging sweetener aspartame.

Especially with products in flavours, you have to pay attention to the additives. The rule is, less is more! Also be careful with Whey blends or concentrates if you are lactose intolerant.

The lactose is often not filtered out sufficiently and can cause reactions. Be sure to check the nutritional value table.

What is my daily protein requirement?

As individual as every person is, so can the daily protein requirement be. It depends not only on your age, gender and life situation, but also on your training goals.

A healthy person who hardly does any sports needs about 0.8 g of protein per kg of body weight, which corresponds to a daily guideline of 46 g for women and 56 g for men.

People over 60 need about 1 g per kg of body weight, as their natural muscle breakdown progresses more quickly and thus the risk of injury increases.

For recreational athletes, the requirement is about 1.2-1.8 g per kg body weight, depending on whether endurance or muscle building is the goal. For competitive athletes, the requirement is around 2-2.5 g per kg body weight.

Target group protein dosage per kg body weight
Non-athletes up to 60 years 0.8 g per kg body weight
Non-athletes over 60 years 1 g per kg body weight
Recreational athletes 1.2-1.8 g per kg body weight
Competitive athletes 2-2.5 g per kg body weight

A good guideline is: per training session, the body can optimally utilise a protein quantity of about 30 g and convert it into amino acids.

What happens in the event of an overdose of Whey Isolate?

Basically, an overdose of Whey Isolate can lead to an increased feeling of thirst. The more Whey Isolate you consume, the more your kidneys work and excrete urea.

It is therefore important to drink Whey Isolate with enough water to avoid dehydration. Furthermore, flatulence can occur.

If the intestine is overloaded and surprised with a large amount of protein, it happens that the protein molecules are not completely split into their individual parts and are thus metabolised by bacteria and gases are formed.

Those who do not consume enough dietary fibre will more easily develop flatulence if they consume a large amount of protein.

In case of extreme overdose in the long term, there are also warnings of liver damage, kidney damage, osteoporosis and other diseases.

Will Whey Isolate help me lose weight?

If you train regularly and enrich your diet with protein-rich foods or Whey Isolate, you can speed up your metabolism and burn more body fat.

It is a fact that protein provides a good satiety effect and can keep blood sugar levels stable. If you eat a protein-rich diet, you will not get the hunger signal from your body as quickly and can thus prevent hunger attacks.

The protein lever effect describes this phenomenon. It is assumed that you eat food until your protein appetite is satisfied.

Protein not only satisfies you for longer, but is also lower in calories.

Whey Isolate is satiating and contains hardly any carbohydrates. Nevertheless, regular training is necessary to lose body mass. (Image source: / Yunmai)

You can save yourself some calories by replacing your dinner with a protein shake.

To lose weight, however, it does not make sense to consume whey isolate in addition to meals without any exercise.

Although Whey Isolate contains hardly any carbohydrates and fat, it still has calories. So it is always crucial that you exercise - this is the only way to accelerate your fat burning.

Is Whey Isolate suitable for vegetarians and vegans?

Vegetarians and vegans like to use protein shakes to cover their protein requirements on a purely plant-based diet.

While Whey Isolate is well suited for vegetarians, it is not an alternative for vegans because it is made from animal whey.

There are now enough plant-based protein sources from which vegan raw food protein powder is made.

Protein sources include legumes such as peas and lentils, nuts such as walnuts and cashews, cereal products such as rice and oats, and pseudocereals such as quinoa and hemp.

In terms of amino acid profile and biological value, vegetable protein isolates differ from whey isolate, but they contain healthy dietary fibres.

Is Whey Isolate lactose-free?

Due to its low lactose content, pure Whey Isolate is ideal for people with lactose intolerance.

All too often, however, a protein powder is sold as an isolate and only when you take a closer look at the nutritional value table do you realise that it contains a concentrate instead of pure isolate.

Concentrates are not as highly filtered and contain more lactose. In principle, manufacturers label their product as lactose-free if it contains harmlessly small amounts of lactose.

If in doubt, simply listen to your body and change manufacturers if you experience side effects such as abdominal pain or diarrhoea.

What are the alternatives to Whey Isolate?

Here we have summarised the best alternatives to Whey Isolate and their advantages and disadvantages. When it comes to proteins, a distinction is made between vegetable and animal protein sources.

Animal sources of protein include tuna, pork, cottage cheese, quark and egg white.

Vegetable protein sources include tofu, lentils, hemp, quinoa, oatmeal and nuts.

Hen's egg has a biological value of 100. Whey isolate has a biological value of 104-140 and is therefore an enormously high-quality protein in terms of quality. (Image source: pixabay.jpg / Bruno Glätsch )

Basically, you can cover your daily protein requirements with a healthy and balanced diet. You can find more about this here:

If you want to supplement your diet with protein isolate, the following are some of the alternatives to whey isolate:

Casein Isolate

Casein isolate is also made from milk, but it is not the by-product of cheese production but the protein part that is processed into cheese.

The biological value of casein protein is 77. Since the molecules are larger and bulkier than those of whey protein, it can take several hours for the body to absorb casein protein.

On the other hand, it is more satiating than whey isolate. Casein isolate is ideal before bedtime to repair and build tissue while you sleep. It is not suitable for vegans.

Vegetable Protein Isolate

Plant protein isolate from hemp, soy, peas, beans, quinoa or other non-animal protein sources is also suitable for vegans.

The advantage here is that vegetable proteins contain valuable dietary fibre and are therefore even easier to digest than whey protein. On the other hand, they enter the bloodstream more slowly and do not contain all the essential amino acids.

Other animal and plant proteins offer an alternative to Whey Isolate, but can only replace it to a limited extent.

Since Whey Protein has the highest biological value, it cannot be surpassed in muscle metabolism.

Decision: What types of Whey Isolate are there and which one is right for you?

Whey protein is offered in three main types, which differ on the one hand in the manufacturing process and on the other hand in purity:

  • Whey Isolate
  • Whey Concentrate
  • Whey Hydrolysate
  • Mixture of Whey Isolate and Whey Concentrate

What distinguishes Whey Isolate and what are the advantages and disadvantages?

Pure Whey Isolate is probably the most expensive Whey Protein on the market, but it is practically fat-free, lactose-free and carbohydrate-free (> 1g).

Whey isolate consists of at least 90% animal protein. When produced by cross-flow microfiltration rather than ion exchange, it has an excellent amino acid profile and is ideal for building muscle and burning fat.

Whey isolate is so expensive because it is more complex to produce than whey concentrate.

  • 90-95 % protein content
  • Few calories
  • Lactose-free
  • High price
  • Unsuitable for vegans

What are the advantages and disadvantages of Whey Concentrate?

Whey concentrate is not as highly filtered as whey isolate and therefore contains only 70-80 % animal protein, but more fat and carbohydrates.

It is also rich in amino acids, but is absorbed more slowly than pure isolate due to the additional nutrients.

Whey concentrate is less suitable for lactose intolerant people, but in terms of price it is probably the cheapest of the three variants.

  • 70 % protein content
  • Longer feeling of satiety
  • Low price
  • Higher in calories
  • Usually not lactose-free
  • Unsuitable for vegans

What are the advantages and disadvantages of Whey Hydrolysate?

In the case of whey hydrolysate, either isolate or concentrate has been broken down again by hydrolysis - it has already been pre-digested, so to speak.

Since your body no longer has to break down the protein, hydrolysate is absorbed even faster. Here, too, caution applies, because manufacturers are not obliged to disclose the hydrolysate content and mix isolate or concentrate with the hydrolysate.

On the one hand, this makes the powder taste less bitter, on the other hand, the production of hydrolysate is very expensive. Hydrolysate is therefore one of the more expensive types of whey protein.

Again, a hydrolysis mixture that is made from isolate and has been stretched with isolate is purer than hydrolysate made from concentrate.

  • 70-95 % protein content
  • Fast absorption
  • High price
  • Unpleasant taste
  • Short feeling of satiety

What distinguishes a Whey Mix and what are the advantages and disadvantages?

For many consumers, a mixture of Whey isolate and concentrate represents the happy medium. However, you have to be careful, because the ratio of isolate and concentrate is often unbalanced.

If you study the nutritional value table more closely, you will quickly notice that it usually contains less isolate because it is more expensive to produce.

As a general rule, the further down an ingredient is on the list of ingredients, the less of it is contained in the product.

  • 70-80 % protein content
  • cheaper than pure isolate
  • Poor concentrate-to-isolate ratio
  • Usually not lactose-free
  • Unsuitable for vegans

Buying criteria: You can use these factors to compare and evaluate Whey Isolate

In the following, we will show you which aspects you can use to decide between the many Whey Isolate supplements.

  • Cold processing
  • High protein content
  • Purity - Without additives
  • Flavour

In the following paragraphs, we will explain what is important in the individual criteria.

Cold processing

Cold-processed Whey Isolate is obtained by cross-flow microfiltration. This cross-flow filtration is carried out with filters of different sizes, whereby essential amino acids are retained and other ingredients are mechanically sorted out.

Because the protein is not heated above 80 °C during the production process, it is of higher quality and easier to digest.

Most manufacturers indicate this if the product is cold-processed. If you don't find any information about this, you can assume that the isolate has been heated.

High protein content

A clear quality feature of protein isolate is its high protein content. Not every protein powder delivers what it promises. Pure isolate has a protein content of 90-95%.

With an amino acid content of 45 %, this results in a biological value of up to 140. Since amino acid molecules are very small, protein isolate is easily and quickly absorbed into the bloodstream via the intestines, transported further and converted into the body's own protein.

The maximum absorption of protein in the intestine (up to 70 % more than with protein processed in other ways) is an essential prerequisite for muscle building and the rapid absorption benefits the body especially after a hard training session.

Don't be fooled by labels like Whey Isolate 90 or Iso Whey 100, as it doesn't necessarily tell you anything about the protein content. Look at the nutritional value table - it will tell you the actual protein content!

Degree of purity - without additives

When buying supplements, the purity of the product is important. Look out for chemical terms and abbreviations in the ingredients list. A high-quality Whey Isolate is free from undesirable additives, such as the sweetener aspartame or numerous thickeners and flavourings to enhance the taste.

Not all binders (E numbers) are bad, because they provide the creamy texture of the powder. However, too much of them can pose problems, as they are suspected of triggering intolerances, allergies and intolerances.

Even though many manufacturers offer their Whey Isolate in all kinds of flavours, neutral powders are usually the healthiest.

Claims for other macronutrients such as fat and carbohydrates should also be realistic and below 10 % of the total content.


You are spoilt for choice when it comes to the taste of Whey Isolate. Nowadays, manufacturers offer their isolate in over twenty flavours.

Basically, with neutral-flavoured isolate you save yourself additional flavourings and sweeteners.

However, if you are looking for good taste, you can choose between fruity, chocolaty and nutty isolates - from strawberry cream to cappuccino, mint, double chocolate, caramel and birthday cake flavour, everything is possible.

In contrast to neutral whey isolate, whey hydrolysate often leaves something to be desired in terms of taste. It can taste anything from bitter to sour, which takes some getting used to.

That is why high-quality Whey Hydrolysate is also sold in tablets. The higher the degree of hydrolysis, the less it tastes.

Interesting facts about Whey Isolate

How do I prepare Whey Isolate?

Whey Isolate is taken as a drink with added liquid. By stirring, shaking or mixing, the powder dissolves in the liquid and no lumps form.

Instead of water, some prefer to drink Whey Isolate in combination with milk. The casein in milk is digested more slowly and therefore the protein is not available as quickly - but if you don't mind the extra calories, you can also drink Whey Isolate with milk.

Protein shakes with berries are particularly popular, with additional nutritional supplements such as vitamins and creatine added.

What Whey Isolate recipes are there?

Baking and cooking with Whey Isolate has become very popular in recent years.

From chocolate cake to pizza and homemade ice cream, protein powder can also be used in many ways in the kitchen.

Protein bread is a good solution if you want to eat fewer carbohydrates but don't want to give up bread. (Image source: / Jorgen Haland)

The simplest and most widespread form is probably the protein shake, for which you simply put fruit, whey isolate and water in a blender for two minutes.

If you want to take it up a notch, you can find delicious recipes for crepes, cookies, brownies, tiramisu, muffins and banana bread with Whey Protein on Strong Magazine.

Whey isolate is also ideal for baking bread. Bodylab24 has a tasty protein bread recipe for you to bake.

First and foremost, protein powder replaces flour or sugar in the kitchen - not eggs. If you want to try out your own recipes with protein powder, you can replace about half of the flour with Whey Isolate.

If you substitute all the flour, the mixture would probably become pappy. In general, you should always combine protein powder with moist ingredients, such as yoghurt or bananas, even when baking.

As already mentioned, whey protein also changes its structure when heated. This causes some peptides to break down, but the amino acids still remain, so the effect is not lost.

How do I store Whey Isolate correctly?

Whey isolate should be stored in a dry place so that it does not start to clump. It is also important that you do not handle a wet spoon in the protein pack so that the powder in the pack does not stick together later.

The protein powder does not have to be stored in the refrigerator, but it should always be well sealed and not exposed to strong heat or direct sunlight.

What is the shelf life of Whey Isolate?

Those who want to take expired protein powder again after a longer break from training are often lucky - because protein powder usually lasts much longer than the expiry date promises.

Because isolate is already dry, it does not spoil easily. Although the powder may lose its flavour when the aromas dissipate, it can still be consumed without health concerns.

Whey concentrates with a higher fat content, however, have the possibility of becoming rancid. Therefore, greater caution is advised here if the best-before date has been exceeded.

Image source: / 35482699

References (4)

1. Paul J. Cribb, Andrew D. Williams, Michael F. Carey and Alan Hayes. The Effect of Whey Isolate and Resistance Training on Strength, Body Composition, and Plasma Glutamine. International Journal of Sport Nutrition and Exercise Metabolism. Volume 16, Issue 5, Pages: 494–509.

2. Bumrungpert A, Pavadhgul P, Nunthanawanich P, Sirikanchanarod A, Adulbhan A. Whey Protein Supplementation Improves Nutritional Status, Glutathione Levels, and Immune Function in Cancer Patients: A Randomized, Double-Blind Controlled Trial. J Med Food. 2018 Jun;21(6):612-616.

3. Hayes Alan, Cribb Paul. Effect of whey protein isolate on strength, body composition and muscle hypertrophy during resistance training. Current Opinion in Clinical Nutrition and Metabolic Care. 2008/02/01; 11(1):40-4.

4. Silverberg NB. Whey protein precipitating moderate to severe acne flares in 5 teenaged athletes. Cutis. 2012 Aug;90(2):70-2.

Wissenschaftliche Studie
Paul J. Cribb, Andrew D. Williams, Michael F. Carey and Alan Hayes. The Effect of Whey Isolate and Resistance Training on Strength, Body Composition, and Plasma Glutamine. International Journal of Sport Nutrition and Exercise Metabolism. Volume 16, Issue 5, Pages: 494–509.
Go to source
Wissenschaftliche Studie
Bumrungpert A, Pavadhgul P, Nunthanawanich P, Sirikanchanarod A, Adulbhan A. Whey Protein Supplementation Improves Nutritional Status, Glutathione Levels, and Immune Function in Cancer Patients: A Randomized, Double-Blind Controlled Trial. J Med Food. 2018 Jun;21(6):612-616.
Go to source
Wissenschaftliche Studie
Hayes Alan, Cribb Paul. Effect of whey protein isolate on strength, body composition and muscle hypertrophy during resistance training. Current Opinion in Clinical Nutrition and Metabolic Care. 2008/02/01; 11(1):40-4.
Go to source
Wissenschaftliche Studie
Silverberg NB. Whey protein precipitating moderate to severe acne flares in 5 teenaged athletes. Cutis. 2012 Aug;90(2):70-2.
Go to source