Whey protein isolate vs concentrate: what’s the big difference?

March 26, 2021

Whey protein isolate and whey protein concentrate both come from milk and both provide high-quality, complete protein.

The main difference is filtration. Whey protein isolate is filtered further, so it usually contains more protein per scoop and less lactose, fat, and carbohydrates. Whey protein concentrate is filtered less, so it is usually cheaper, creamier, and slightly higher in carbs and fat.

In simple terms:

Choose whey protein isolate if you want higher protein, lower lactose, and tighter control over calories and macros
Choose whey protein concentrate if you want a cost-effective everyday protein for muscle gain, recovery, and general training
Both can support muscle growth and recovery when paired with regular resistance training and enough total daily protein

Quick comparison table

Feature	Whey protein isolate	Whey protein concentrate
Typical protein content	Around 90% protein	Often around 70-80% protein
Protein per 30 g scoop	Around 26-27 g	Around 21-24 g
Fat per 30 g scoop	Usually 0-1 g	Usually 1-3 g
Carbs per 30 g scoop	Usually 0-2 g	Usually 2-5 g
Lactose remaining	Very low, often trace amounts	Higher than isolate, varies by product
Price	Usually higher	Usually lower
Best for	Cutting, macro tracking, lower lactose needs	Budget, general training, mass gain

These numbers are general industry ranges. Always check the nutrition panel, as values vary by product, flavour, serving size, and formula.

When it comes to training and supplementation, there is no shortage of long-running debates. From the best rep range and rest time to the ideal supplement stack and dosage amounts, there are differing opinions on many subjects. But few topics are more contentious than whey protein isolate v concentrate: which is the superior option?

Besides, what’s the real difference between isolate and concentrate?

While few dispute the benefits of protein supplements, opinion is split on the best type. Here we look at the differences between these two popular protein products and the best use for each type. We also take a broader look at protein supplementation, its benefits, and the other options available.

Why does protein matter for athletes?

Before we get into the pros and cons of the different types, we want to look at protein itself. What is it good for? And how will protein supplements help you achieve your health and fitness goals?

Protein is easily one of the most widely used supplements in the world. Everyone from amateur athletes to champion bodybuilders uses some form of protein supplement to increase their daily protein intake and achieve optimal muscle growth. This could be in one of many forms: a snack bar, a meal replacement, or the trusty post-workout shake.

It is that final use, post-workout, that best speaks to one of the main reasons people use protein supplements. High-quality protein helps support muscle repair, recovery, and lean muscle development when combined with consistent resistance training.

Research supports this general approach. The International Society of Sports Nutrition position stand on protein and exercise states that resistance exercise and protein intake both stimulate muscle protein synthesis, especially when protein is consumed around training. A systematic review and meta-analysis in the British Journal of Sports Medicine also found that protein supplementation can support gains in muscle mass and strength when combined with resistance training.

Science also backs up the role of protein in recovery. A number of studies have found a link between post-workout protein intake and the efficiency of recovery. A protein shake after your gym session has also been linked to better training results, including improved reps to failure.

This is particularly true when protein is taken in conjunction with leucine. Leucine is an essential amino acid that aids in the processing of protein. As such, it helps the body extract the greatest benefit from its protein intake.

Protein can also be useful for people aiming to manage their weight. It is a filling macronutrient, which may help with appetite control. It also helps protect lean muscle mass during a calorie deficit, especially when paired with resistance training.

This matters because weight loss can come from both fat and muscle. By supporting lean muscle, which uses more energy at rest than fat tissue, protein can play a helpful role in a balanced weight loss plan.

For more information about protein, check out our Ultimate Guide to Protein Powder.

Why is whey protein so common in supplements?

If you have been looking into different protein supplements, you have probably noticed the utter dominance of whey protein powder. Most protein products use at least some form of whey-based ingredients. There are three main reasons for this:

Whey is widely available: Whey is actually the by-product of the manufacturing of many dairy foods, including cheese, butter, and yoghurt. As such, not that long ago, producers of these foods had to pay people to take them off their hands. Nowadays, supplement makers tap into this ready supply, using it to make the protein powders we know and love.
Whey is cost-effective: Because it is so widely available, whey is a relatively cheap raw material. The refinement process is also fairly straightforward, meaning the final product is not particularly expensive to create.
Whey works: Whey is one of the best natural protein sources available. It is considered a “complete” protein supplement, containing many other important vitamins, minerals, and health benefits. As such, it is an extremely effective supplement that supports a wide range of fitness goals.

In its most natural form, whey is a thin liquid from cow’s milk. Liquid whey is extracted while making cheese and several other dairy products. Generally speaking, for every kilogram of cheese made, 10 litres of whey is produced.

In addition to high protein content, whey contains all nine essential amino acids. Amino acids are often called the building blocks of life because they bind together to form proteins. They also assist with several other critical biochemical processes and are effectively responsible for enabling the body to work at its best.

While all amino acids are important, nine are considered “essential” because the body does not naturally produce them. This means that to perform at our best, we must take in these amino acids through our diet. While most protein supplements contain at least a few essential nutrients, whey protein provides all nine.

Whey protein may also support appetite control as part of a high-protein diet. Protein-rich foods and supplements can help you feel fuller for longer, although results depend on your total diet, training, lifestyle, and energy intake.

Despite all these benefits, the availability of whey means that it remains a cost-effective option for supplementary protein. Compared to many other products on the market, it provides great value for money, particularly for those taking larger volumes. As such, most gym-goers choose whey as their base protein supplement, combining it with other, more expensive products if they have specific goals or requirements.

To compare the different options, explore our range of whey protein products.

Whey protein isolate vs concentrate: what are the key differences?

Whey protein isolate and concentrate are closely related products, but they are not identical. They both come from whey, both contain complete protein, and both can support recovery and muscle growth when used to help meet your daily protein needs.

However, there are a few subtle but important differences. To truly understand what sets these products apart, we must first examine how whey protein is processed.

As already noted, whey is originally extracted from cow’s milk. Once separated, it goes through a filtration process to help concentrate the protein content. This also helps remove most of the liquid, as well as most of the fat and lactose.

After filtration, what is left is usually about 80% protein and can be dried to make whey protein concentrate. Alternatively, this can be refined to remove almost all the remaining fat, lactose, and cholesterol. This is done via Cross-Flow Microfiltration and leaves a product about 90% protein. This can then be dried to make whey protein isolate.

What do whey isolate and concentrate have in common?

Both whey protein isolate and whey protein concentrate:

Contain all nine essential amino acids
Are complete proteins
Provide leucine, an important amino acid involved in muscle protein synthesis
Digest and absorb relatively quickly
Can be taken after training or used during the day to help meet protein targets
Can support muscle growth, recovery, and body composition goals when paired with the right diet and training

This means you can get the core benefits of whey protein from either option. The better choice depends on your macros, budget, digestion, and training goals.

What is different between whey isolate and concentrate?

Difference	Whey protein isolate	Whey protein concentrate
Processing	Filtered further	Filtered less
Protein concentration	Higher, usually about 90%	Lower, often about 70-80%
Lactose	Lower	Higher
Fat and carbs	Lower	Higher
Texture	Often lighter	Often creamier
Cost	Usually more expensive	Usually more affordable
Best fit	Lean protein intake and strict macros	Everyday protein and budget-friendly muscle gain

All that being said, the additional filtration process does create a few important differences. Most notably, the extra processing of protein isolate impacts:

The amount of protein: As a more concentrated product, protein isolate gives you more protein per scoop. As noted above, protein isolate is usually about 90% protein, whereas protein concentrate is generally 80% protein or less. Some products have as little as 30% protein.
The macronutrient balance: While both products are lean sources of high-quality protein, protein isolate is leaner. As protein concentrate undergoes less refinement, it contains more carbohydrates and fat. This is an important consideration if you are tightly controlling your macronutrient intake.
The production cost: As protein isolate undergoes additional filtration, it costs more to produce. Also, as protein is the most valuable macronutrient, the higher concentration of protein isolate increases its value. As a result, while both products are relatively cost-effective, protein isolate is usually more expensive to buy than protein concentrate.

Who should take whey protein isolate?

Whey protein isolate may be a good fit if you have specific training goals, strict nutrition targets, or prefer a protein powder with less lactose, fat, and carbohydrates. It usually costs more than concentrate, but it can give you more protein per scoop.

Best for weight loss or cutting

Protein isolate is often useful during a calorie deficit because it delivers high protein with fewer added carbs and fats. This can make it easier to increase protein intake while keeping calories controlled.

Best for macro tracking

The higher protein concentration and lower carbohydrate and fat content make protein isolate a lean protein source. It provides a high level of control, allowing you to increase your protein intake without affecting your other macros as much.

Best for lower lactose needs

Because it is highly filtered, protein isolate is usually lower in lactose than protein concentrate. This may make it a more suitable option for people with sensitive stomachs or those who prefer lower-lactose protein powders.

That said, whey isolate is still dairy-based. If you are highly lactose intolerant or have a milk allergy, check the label carefully and speak with a health professional before using it.

Best for lean muscle goals

If you want to build lean muscle while keeping fat and carbohydrate intake tightly managed, protein isolate can be a practical option. It gives you a concentrated protein source that is easy to fit into a structured training diet.

However, there is one consideration when taking protein isolate. Because it has virtually no fat, it has little to no fat-soluble vitamins. As these are important to your overall health and performance, you will need to make sure you get these from other sources. If you eat a balanced diet, this should not be a problem.

Who should take whey protein concentrate?

Whey protein concentrate may be a good fit if you want an affordable, everyday protein powder and do not need the lowest possible lactose, fat, or carbohydrate content.

Best for muscle gain on a budget

Because protein concentrate is usually cheaper than protein isolate, it is a popular choice for people who want to increase protein intake without spending as much. This makes it a useful option for beginners, regular gym-goers, or anyone taking protein consistently.

Best for general training

Protein concentrate is still a lean source of high-quality protein. Its slightly higher fat and carbohydrate content may suit people who are not tightly restricting calories or macros.

Best for hard gainers

Because of protein concentrate’s more balanced macronutrient profile, it can be useful for “hard gainers”. While it is still a lean source of high-quality protein, its comparatively higher fat and carbohydrate content means it can suit people trying to build mass.

Best for taste and texture

Because it is less refined, many people prefer the flavour and texture of protein concentrate. Those who do often say that it is smoother and creamier, which can make it more pleasant to take.

With all of this in mind, it is understandable that many consider protein concentrate the easier choice. It is a solid option that you can take regularly without too much careful planning. You can also increase your intake without as much of a need to rebalance your other macros.

That being said, if you choose protein concentrate for the cost and require a larger volume of protein, you will need to plan this carefully. Increasing your dose to meet your protein needs will also increase your carbohydrate and fat intake. If your diet is not adjusted accordingly, this could lead to additional weight gain.

What other whey protein products are available?

The world’s love affair with whey protein extends beyond isolates and concentrates. While these two types are the most common, the following whey protein products are also widely available:

Hydrolysate: This takes the refinement process further, exposing it to an enzyme that helps break the amino acids down. This can help with digestion and speed up the absorption of the protein. It’s particularly good for people with sensitive stomachs, as it is effectively pre-digested, making it much easier for the body to process.
Burner blends: Some supplement suppliers provide blended products to meet specific training goals. Most burner blends combine whey protein, usually isolate and concentrate, with other slower-release proteins and ingredients that may support energy or fat loss goals, such as green tea, caffeine, or guarana. MAX’S Super Shred is one example of this type of formula.
Gainer blends: Similar to a burner blend, a gainer blend combines multiple ingredients to help you build mass faster. These products usually contain several protein types, including whey protein isolate and concentrate, and high carbohydrate content. MAX’S Absolute Mass is one example of a mass gainer formula.
Slow release blends: These products are specifically designed to support recovery and muscle development while you sleep. They usually contain whey protein, generally only concentrate, and several other types of slower-release protein. They often also include ingredients that support quality sleep, such as chamomile and skullcap, and encourage HGH production, such as L-Arginine and L-Glutamine. MAX’S Anabolic Night is one example of a slow-release protein blend.

What are other options for protein supplementation?

There are many ways to get more protein into your system. The best option for you will depend on your goals and dietary requirements. Other protein options you may want to consider include:

Casein: This is the other type of protein sourced from milk. In fact, 80% of the protein in milk is casein. Casein is known for its slower digestion rate, making it useful before bed to aid muscle growth and recovery. It also contains higher levels of leucine, which is an essential amino acid that supports protein absorption.
As such, it is often used in conjunction with whey protein isolate or whey protein concentrate for a more sustained release of protein.
Pea protein: Often seen as the most well-rounded plant-based alternative to whey, this is a great option for people with specific dietary requirements, such as vegans.
Like whey, pea protein is considered complete as it contains all nine essential amino acids, though not at the same levels as whey. It is also possible to get both pea protein isolate and pea protein concentrate, which generally indicates how much protein is in the product.
Soy protein: As in the culinary world, when it comes to supplements, soy has long been considered the preferred alternative for those not eating animal products. It is also well-regarded for its ability to help increase bone density and improve cardiovascular health.

There are some concerns about a link between soy products and increased oestrogen levels, but there is limited scientific evidence to support this claim.
Hemp protein: While it is currently less widely used than other types, hemp protein is gaining popularity. This is partially because of its reputation as one of the most natural products and partially because it is a good source of omega-3. Omega-3 is a fatty acid that is best known for its ability to reduce the risk of heart disease.

However, while hemp protein is complete, meaning it has all nine essential amino acids, it is low in several of these, like lysine. As such, it is best to use hemp protein in combination with other proteins to make sure you are getting the complete nutritional benefit.

Whey protein isolate vs concentrate: which should you choose?

At-a-glance recommendation

Goal or need	Better fit	Why
Weight loss or cutting	Whey protein isolate	Higher protein with fewer carbs and fats
Muscle gain on a budget	Whey protein concentrate	Lower cost and slightly more calories
Sensitive stomach or lower lactose preference	Whey protein isolate	More filtration usually means less lactose
Everyday protein intake	Whey protein concentrate	Cost-effective and easy to use regularly
Strict macro tracking	Whey protein isolate	More protein per scoop and fewer extras
Creamier taste and texture	Whey protein concentrate	Less filtration often gives a smoother mouthfeel
Post-workout recovery	Either	Both provide complete whey protein

In the debate around protein isolate v concentrate, there is no single winner. Both are useful options for increasing protein intake, and both can support muscle growth and recovery when your diet and training are set up properly.

That being said, there are a few key differences between these products that should be considered. While protein isolate provides a higher protein content, it is generally more expensive. Conversely, while protein concentrate is cheaper, it also has a higher carbohydrate and fat content.

Go with whey protein isolate if you want higher protein per scoop, lower lactose, fewer carbs and fats, and tighter control over your macros. It is often the better choice for cutting, lean muscle goals, or sensitive digestion.

Go with whey protein concentrate if you want a more affordable everyday protein powder, prefer a creamier texture, or are focused on building muscle on a budget. It is often the better choice for general training and mass gain.

Also, it is important to remember that whichever option you choose, a protein supplement alone will not deliver your desired results.

Most experts recommend getting most of your daily protein from high-quality dietary sources. This means that if you want to up your protein intake, you should increase the amount of dairy, eggs, and poultry you eat. For more information on optimising your diet based on your goals, check out our Ultimate Nutrition Guide.

Your training regime is also critical, as, without regular exercise, your body will have nothing to do with the extra protein. Whether you are a fitness beginner looking to increase your strength and stamina or an experienced gym-goer looking to take your gains to the next level, your workout plan needs to be designed to support your goals. For more information on putting together the perfect training plan, see our Ultimate Training Guide.

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