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Whey Protein Isolate has the image of helping athletes build muscle. However, you are not yet convinced of its effect and would like to learn more about the intake, scientific background and necessary criteria for the purchase of Whey Protein Isolate? Then you've come to the right place.

We are pleased that you have found your way to our great Whey Protein Isolate Test 2021. We will provide you with all the information you need about Whey Protein Isolate. You will not only learn what Whey Protein does, but also what it is made of.




The most important facts

  • Whey Isolate is the English word for isolated protein from whey. It has a high protein content and the highest biological value.
  • It is available as a powder and is taken diluted with sufficient liquid. You can use Whey Isolate to specifically stimulate muscle metabolism and thus build muscle mass faster.
  • Whey isolate is more complex to produce than whey concentrate and does not taste as bitter as whey hydrolysate. One advantage of Whey Isolate is that it is purer, higher in protein, and almost lactose-free.

The Best Whey Protein Isolate: Our Picks

Buying and evaluation criteria for Whey Protein Isolate

When deciding which Whey Protein Isolate is best for you, you should pay attention to various criteria:

Always look for high quality and, if necessary, ask to see the manufacturer's certificates.

Protein content

One of the decisive quality features of Whey Protein Isolate is the high protein content. Not all protein powders are the same and correspond to what they advertise. Good and pure Whey Protein Isolate has a protein content of 90-95%.

Whey Protein Isolate has an amino acid content of 45 %, which gives it a biological value of up to 140. Amino acid molecules are very small and are quickly absorbed into the bloodstream via the intestines and converted into the body's own protein.

Due to the purity of Whey Protein Isolate, the individual amino acids can be absorbed more quickly(2).

Suppliers like to use labels in which 90 or 100 appear in the name, but these are deceptive and do not necessarily say anything about the protein content.

The maximum absorption of protein in the intestine is 70% and provides the best prerequisite for muscle building and the rapid absorption benefits the body especially after a workout.

Taste

Nowadays, manufacturers offer such a wide range of flavours that there should be something for everyone. Whey Protein Isolate is available in neutral, vanilla, cookie and more unusual flavours.

If you opt for a neutral-flavoured Whey Protein Isolate, you save on added flavours and sweeteners.

However, if you're looking for great taste, you can choose from fruity, chocolatey and nutty Whey Protein Isolate or add fruity yoghurt or fruit to your neutral protein powder.

In contrast to neutral Whey Protein Isolate, Whey Protein Hydrolysate often tastes bitter to sour and can take some getting used to.

For this reason, you can also get high-quality Whey Protein Hydrolysate in tablet form. The higher the degree of hydrolysis, the less it tastes.

Additives / Purity

When buying supplements, you should pay attention to the purity and composition of the product. In particular, check the list of ingredients for chemical terms or abbreviations.

A very pure and high-quality Whey Protein Isolate is free of additives, such as the sweetener aspartame or thickeners and flavourings to enhance the taste.

However, too much binder in protein powder can present problems, as they are suspected of triggering intolerances, allergies and intolerances.

The healthiest variant of Whey Protein Isolate are the flavourless products, even though the protein powders with flavour have their appeal.

As far as macronutrients are concerned, you should make sure that the fat and carbohydrate content is below 10% of the total content.

Processing

Cross-flow filtration uses filters of different sizes to preserve the essential amino acids. In this process, the Whey Protein Isolate is cold-processed and cross-flow microfiltration is used to mechanically separate out all other ingredients.

If the Whey Protein is not heated above 80 °C during production, the end product is of higher quality and easier to digest.

Therefore, when buying, make sure that the manufacturer specifies processing below 80°C. If this is not the case and there is no indication, then you should assume that the Whey Protein Isolate has been heated.

Vegan / Vegetarian

To meet the protein requirements of a vegetarian or vegan diet, you can use protein shakes.

Normal Whey Protein Isolate is suitable for vegetarians without hesitation. However, this is not an alternative for vegans, as it is made from animal whey.

Some manufacturers have focused exclusively on the production of vegan protein powders, with vegetable protein, as there are enough vegetable protein suppliers.

Protein sources include legumes such as peas and lentils, nuts, 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 fibre.

Guide: Frequently asked questions about Whey Protein Isolate answered in detail

In order to inform you comprehensively about the effectiveness of Whey Protein Isolate and to give you an understanding of the current state of science, we have summarised all the important information in the following sections.

What is Whey Protein Isolate and how is it made?

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, especially Whey Isolate is considered a popular dietary supplement and substitute.

When whey protein concentrate is obtained, the concentrate is filtered until there is a small amount of fat, carbohydrates and sugar and it is 90-96% high quality protein.

Whey Protein Isolate-1

A sports nutrition supplement that is well studied and researched in the health and fitness industry to help increase strength and muscle mass. (Image source: HowToGym / Unsplah)

Whey protein contains all nine essential amino acids, which are absorbed through food and cannot be produced by the body itself.

In particular, the BCAAS amino acids, which promote muscle growth, are contained in Whey Isolate(3).

Production

To ensure that only the isolated whey protein remains, the ion exchange process or the microfiltration process is used.

This almost completely removes liquid, fat and carbohydrates such as lactose from the whey protein. For a long shelf life, the whey protein is pulverised.

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.

The different flavours are added at the end of the process through flavours and/or sweeteners(4).

Whey, which is needed for the production of Whey Isolate, is a by-product of cheese and quark production and basically has a very low protein content of less than 1%.

What does Whey Protein Isolate do?

Whey is mainly known from weight training for muscle building and maintenance. Whey isolate is the purest form of food supplement and has become indispensable in weight training.

  • Health support: Whey Isolate is used for digestive health, cancer prevention, high blood pressure and treatment of osteoporosis(5).
  • Slowing muscle breakdown: Whey Isolate acts as an antioxidant to counteract cell ageing and can slow muscle breakdown in old age(6).
  • Feeling of satiety: 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.

It has also been proven that people who supplement with Whey protein achieve a greater training effect in the areas of strength and body shape, or body fat(7, 8).

When and for whom is it useful to take Whey Protein Isolate?

Whey products, including Whey Isolate, can be taken by anyone. It is particularly suitable for people who train regularly and want to build muscle mass and burn body fat at the same time(7, 8). It is absolutely necessary to consume enough protein when building muscle.

Whey Protein Isolate-2

A healthy and balanced diet is crucial for building muscle quickly.
(Image source: John Arano / Unsplash)

Older people or people with a diet that excludes animal protein should make sure they have enough protein in their diet and can supplement it with Whey products.

Sufficient protein is very important during growth, but the manufacturers point out that pregnant women, children and adolescents should not consume the protein powder.

People with an increased protein requirement and healthy kidneys can take Whey Isolate without hesitation. You should take the protein powder with sufficient liquid so that the breakdown products can be excreted from your body.

The myth that protein powder makes you fat or that too much ammonia and urea are produced during protein metabolism and overload the kidneys still exists.

However, it has been proven that intact kidneys, whether young or old, are not damaged by protein consumption.

What is the difference between Whey Protein Isolate and other Whey products?

Whey Protein Isolate is purer than other Whey Protein products due to the manufacturing process and contains hardly any fat, lactose or carbohydrates due to the filtering process.

The proportion of these three components is about 1 g. For this reason, Whey Protein Isolate is also more expensive than other Whey products.

Whey Protein Isolate consists of at least 90 % animal protein. If it is produced by cross-flow microfiltration and not by ion exchange, it has an excellent amino acid profile.

This property is perfect for active people who want to build muscle.

What are the different types of Whey Protein?

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

Type Description
Whey Protein Isolate 90-95% protein content, low calorie, lactose free, not suitable for vegetarians
Whey Protein Concentrates 70-80% protein content, keeps you fuller longer, higher calorie, not lactose free
Whey Protein Hydrolysate 70-90% protein content, expensive, unpleasant and bitter taste

In the following we have explained Whey Protein Concentrate & Hydrolysate in more detail:

Whey Protein Concentrate

Unlike Whey Protein Isolate, Whey Concentrate is not as heavily filtered and for this reason contains only 70-80% animal protein. Because Whey Concentrate is not so heavily filtered, the powder also contains more fat and carbohydrates.

Whey concentrate is not suitable for vegans and lactose-intolerant people, as it contains lactose compared to isolate.

It is rich in amino acids, but is absorbed more slowly than pure isolate due to the additional nutrients. Whey concentrate is the least expensive of all three products.

Whey Protein Hydrolysate

Whey hydrolysate consists of either whey protein isolate or concentrate that has been broken down again.

This splitting means that your body no longer has to break down the individual proteins and they are therefore absorbed more quickly. Hydrolysate is therefore one of the more expensive types of whey protein.

You should buy whey protein hydrolysate with caution, as manufacturers are not obliged to state the hydrolysate content. It could be the case that Whey Protein Isolate and Concentrate are simply mixed together.

On the one hand, this makes the powder taste less bitter, on the other hand, the production of hydrolysate is very expensive. Again, a hydrolysis mixture that is made from isolate and then blended with isolate is purer than hydrolysate made from concentrate.

How do I take Whey Protein Isolate?

It is generally recommended to take Whey Protein Isolate with sufficient liquid. Whey Protein Isolate can be taken directly with breakfast or after a workout.

At these times your body is very receptive to protein.

Whey Protein Isolate-3

Whey Protein Isolate can easily be mixed with your yoghurt and refined with tasty fruits and nuts. (Image source: Julian Hochgesang / Unsplash)

If you mix Whey Protein Isolate with other foods or drinks, your body needs a little longer to digest them than with water.

Many prefer to take the protein powder with milk or other liquid foods such as yoghurt to achieve a better taste.

Many retailers offer protein shakers. These have a removable strainer to prevent lumps from forming.

The shaker is also ideal to take with you to training or work. The dosage of the Whey Protein Isolate should be taken from the packaging.

There you will often find grams per body weight or the daily protein requirement.

What are the risks and side effects of Whey Protein Isolate?

The terms Whey Protein or dietary supplements often have a bad image from the start. However, a high-quality Whey Isolate is nothing more than filtered-out protein and the fear is therefore completely unfounded.

As long as you stick to the recommended dosage and take the powder with enough liquid and drink plenty, taking Whey Protein Isolate is safe.

If you have medical conditions and impaired kidney function, you should refrain from consuming additional protein powder. Otherwise you can take Whey Protein Isolate without hesitation.

However, you should still keep in mind that the consumption amount of 400 g protein per day should not be exceeded.

This includes food consumption and consumption of protein powder. If the requirement of 400 g is exceeded, harmful effects can occur.

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

The vast majority, including people with mild kidney disease, can tolerate protein well.

In adolescents, the consumption of whey protein products should be monitored, as side effects have been scientifically researched and have shown that the intake of whey protein promotes acne.

A basic connection between the consumption of whey products and acne already exists, but it is unclear which ingredient is responsible for this(9).

What are the alternatives to Whey Protein Isolate?

Plant and animal protein sources offer an alternative to Whey Protein Isolate. We have listed these with their advantages and disadvantages.

  • Animal protein sources: Tuna, chicken, pork, cream cheese grains, cottage cheese and egg whites(10).
  • Plant sources of protein: Soy, lentils, beans, tofu, hemp, quinoa, oatmeal and nuts(10, 11).

The daily protein requirement can be covered by a balanced and healthy diet.

If you want to supplement your diet with protein isolates, the following are some of the alternatives to Whey Protein Isolate:

Vegetable protein is made from hemp, soy, peas, beans, quinoa or other non-animal protein sources.

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 Protein 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.

Image source: Mironova / 123rf

References (11)

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.
Source

2. Brosnan JT, Brosnan ME. Branched-chain amino acids: enzyme and substrate regulation. J Nutr. 2006 Jan;136(1 Suppl):207S-11S. doi: 10.1093/jn/136.1.207S. PMID: 16365084.
Source

3. Sahathevan, S., Se, C. H., Ng, S., Khor, B. H., Chinna, K., Goh, B. L., ... & Karupaiah, T. (2018). Clinical efficacy and feasibility of whey protein isolates supplementation in malnourished peritoneal dialysis patients: A multicenter, parallel, open-label randomized controlled trial. Clinical nutrition ESPEN, 25, 68-77. Es konnte gezeigt werden, dass ein einziger Makronährstoff-Ansatz mit WPS bei unterernährten CAPD-Patienten eine DPI-Adäquatheit und Verbesserungen in Bezug auf Gewicht, BMI, Hautfaltenmaße, Serumharnstoff und nPCR-Spiegel erzielt.
Source

4. Hans-Dieter Belitz, Werner Grosch, Peter Schieberle (Hrsg.): Lehrbuch der Lebensmittelchemie. Edition: 5, Springer, 2001, S. 494, ISBN 3-540-41096-1.
Source

5. 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.
Source

6. Sahathevan, S., Se, C. H., Ng, S., Khor, B. H., Chinna, K., Goh, B. L., ... & Karupaiah, T. (2018). Clinical efficacy and feasibility of whey protein isolates supplementation in malnourished peritoneal dialysis patients: A multicenter, parallel, open-label randomized controlled trial. Clinical nutrition ESPEN, 25, 68-77. Es konnte gezeigt werden, dass ein einziger Makronährstoff-Ansatz mit WPS bei unterernährten CAPD-Patienten eine DPI-Adäquatheit und Verbesserungen in Bezug auf Gewicht, BMI, Hautfaltenmaße, Serumharnstoff und nPCR-Spiegel erzielt.
Source

7. Brosnan JT, Brosnan ME. Branched-chain amino acids: enzyme and substrate regulation. J Nutr. 2006 Jan;136(1 Suppl):207S-11S. doi: 10.1093/jn/136.1.207S. PMID: 16365084.
Source

8. 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.
Source

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

10. Matejka, R. (2015). Gesunde Ernährung: Was stimmt denn nun wirklich?. Erfahrungsheilkunde, 64(02), 100-105.
Source

11. Fangauf, K. W. (1977). Entwicklung und Bedeutung pflanzlicher Proteine in der menschlichen Ernährung. Fette, Seifen, Anstrichmittel, 79(1), 9-14.
Source

Why you can trust me?

Wissenschaftlicher Artikel
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
Wissenschaftlicher Artikel
Brosnan JT, Brosnan ME. Branched-chain amino acids: enzyme and substrate regulation. J Nutr. 2006 Jan;136(1 Suppl):207S-11S. doi: 10.1093/jn/136.1.207S. PMID: 16365084.
Go to source
Klinische Studie
Sahathevan, S., Se, C. H., Ng, S., Khor, B. H., Chinna, K., Goh, B. L., ... & Karupaiah, T. (2018). Clinical efficacy and feasibility of whey protein isolates supplementation in malnourished peritoneal dialysis patients: A multicenter, parallel, open-label randomized controlled trial. Clinical nutrition ESPEN, 25, 68-77. Es konnte gezeigt werden, dass ein einziger Makronährstoff-Ansatz mit WPS bei unterernährten CAPD-Patienten eine DPI-Adäquatheit und Verbesserungen in Bezug auf Gewicht, BMI, Hautfaltenmaße, Serumharnstoff und nPCR-Spiegel erzielt.
Go to source
Lehrbuch
Hans-Dieter Belitz, Werner Grosch, Peter Schieberle (Hrsg.): Lehrbuch der Lebensmittelchemie. Edition: 5, Springer, 2001, S. 494, ISBN 3-540-41096-1.
Go to source
Wissenschaftlicher Artikel
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
Klinische Studie
Sahathevan, S., Se, C. H., Ng, S., Khor, B. H., Chinna, K., Goh, B. L., ... & Karupaiah, T. (2018). Clinical efficacy and feasibility of whey protein isolates supplementation in malnourished peritoneal dialysis patients: A multicenter, parallel, open-label randomized controlled trial. Clinical nutrition ESPEN, 25, 68-77. Es konnte gezeigt werden, dass ein einziger Makronährstoff-Ansatz mit WPS bei unterernährten CAPD-Patienten eine DPI-Adäquatheit und Verbesserungen in Bezug auf Gewicht, BMI, Hautfaltenmaße, Serumharnstoff und nPCR-Spiegel erzielt.
Go to source
Wissenschaftlicher Artikel
Brosnan JT, Brosnan ME. Branched-chain amino acids: enzyme and substrate regulation. J Nutr. 2006 Jan;136(1 Suppl):207S-11S. doi: 10.1093/jn/136.1.207S. PMID: 16365084.
Go to source
Wissenschaftlicher Artikel
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
Klinische 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
Wissenschaftlicher Artikel
Matejka, R. (2015). Gesunde Ernährung: Was stimmt denn nun wirklich?. Erfahrungsheilkunde, 64(02), 100-105.
Go to source
Wissenschaftlicher Artikel
Fangauf, K. W. (1977). Entwicklung und Bedeutung pflanzlicher Proteine in der menschlichen Ernährung. Fette, Seifen, Anstrichmittel, 79(1), 9-14.
Go to source
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