What is the difference between WPC and WPI? A complete guide
WPC and WPI are the two most popular types of whey protein you will find in supplement stores and in the diets of people who train. Both come from the same base - milk whey - but they differ in the way they are processed and in their final composition. Above all, they differ in protein purity, the amount of lactose and fat, and… price, which is usually higher for the more “purified” isolate. Although both types support muscle building and recovery, how well they fit depends on your training goals and dietary tolerance. Below you will find a clear comparison and practical tips to help you choose the best protein for you.
WPC vs WPI – key differences
WPC (whey protein concentrate) → usually contains around 70 – 80 % protein, with the rest being lactose, fats and carbohydrates. It is cheaper and more versatile.
WPI (whey protein isolate) → undergoes additional filtration, giving ≥ 90 % protein, a minimal amount of lactose and fat, and faster absorption. Often chosen when cutting, on restrictive diets or with a sensitive digestive system.
Key differences between WPC and WPI
Difference in macronutrients
- WPC contains more fat (4-8%) and lactose (4-10%).
- WPI has a higher protein concentration and fewer “extras”; fat content is approx. 0,5–1%, and lactose 0,5-1%.
Difference in tolerance:
- The higher amount of lactose in WPC may be problematic for people with lactose intolerance.
Difference in price and use
- WPC is usually cheaper, tastier and sufficient for general protein supplementation in the diet.
- WPI is more expensive, but a better fit if you want minimal extras or are looking for a “cleaner” source of protein.
WPC vs WPI – comparison table
| Feature | WPC (concentrate) | WPI (isolate) |
|---|---|---|
| Protein content | ~ 70-80% (lower) | ~ 80-90+% (higher) |
| Lactose | 4-10% (more) | 0,5-1% (less) |
| Fat | 4-8% (more) | 0,5-1% (less) |
| Calories | higher | lower |
| Taste/texture | milky, thicker texture | Usually lighter texture |
| Price | cheaper | more expensive |
| Best use | everyday use, bulking | cutting, lactose intolerance |
| Absorption | fast | very fast |
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What is WPC?
WPC is an abbreviation for Whey Protein Concentrate – i.e. whey protein concentrate. It is a form of protein obtained from milk that contains a mixture of proteins, lactose and small amounts of fat, carbohydrates and other components. This means that concentrate is less “purified” than isolate, but it also more often has a more natural taste and texture.
How much protein is in WPC?
Typically around 70–80 % protein by dry weight, although exact values may differ between products and brands.
Who is WPC for?
Concentrate is great for people who:
- want to add protein to their daily diet,
- have normal lactose tolerance,
- do not count every calorie and macro,
- are looking for a more budget-friendly and versatile option.
Most common benefits of WPC
- Price - usually cheaper than isolate.
- Taste - the presence of lactose/fat often improves the flavour.
- Versatility - a good choice as an everyday protein addition.
Example WPC product: 7Nutrition Whey Protein 80 2000g - a classic whey protein concentrate with a high protein content and good value for money.
What is WPI?
WPI is an abbreviation for Whey Protein Isolate - whey protein isolate. Unlike concentrate, isolate undergoes additional filtration processes, making it more purified, containing less lactose and fat, and giving a higher percentage of protein by dry weight.
When does WPI have an advantage over WPC?
- When you want the maximum amount of protein without extras.
- During fat loss (fewer calories).
- With lactose intolerance or digestive problems.
Examples of WPI products:
- 7Nutrition Whey Isolate 90 – a classic whey protein isolate with a high protein content.
- 7Nutrition Natural Whey Isolate 90 – the “natural” version of the isolate with a very clean composition, without sugar or sweeteners.
WPC vs WPI – which supplement has less lactose?
In practice WPI has less lactose than WPC, because isolate undergoes additional filtration processes that “filter out” a larger part of the milk sugar and fat. In turn WPC (concentrate) is less purified, so it usually retains more lactose. This is why people with a sensitive digestive system (bloating, gurgling, discomfort after a shake) more often choose WPI as a “lighter” option for the stomach.
Mini-guide:
- If WPC gives you bloating / discomfort / a feeling of heaviness → try WPI.
- If you tolerate dairy well (milk, yoghurts, cheeses) → WPC is usually more than enough.
What is better for bulking, cutting and “clean eating”?
WPC or WPI for bulking?
When bulking WPC is the most commonly chosen solution, because it is economical, versatile and lets you easily hit your protein target without overpaying. In addition, a little fat and lactose in the concentrate often improves taste and texture, which matters when drinking it regularly.
However, it is worth remembering one thing: weight gain is not determined by the type of supplement, but by the calorie balance and overall macros (protein, carbohydrates and fats over the course of the day).
WPC or WPI for cutting?
When cutting WPI can be more convenient, because it is “cleaner”: it usually has more protein per serving and less fat and lactose. This makes it easier to hit your macros, especially when you are watching calories and do not want “accidental” extras from the supplement.
WPI also often works well as a post-workout protein, because it is light and quick to drink even when appetite is low.
Who is WPC for, and who is WPI for?
- If you are starting training and want the best value for money → WPC
- If you have a sensitive stomach / suspected lactose intolerance → WPI
- If you are cutting and watch every gram of macros → WPI
- If you are looking for protein for oatmeal, pancakes, desserts → WPC
- If you mainly drink protein after training → both are OK, but WPI is usually “lighter”
- If you do not like milky shakes and prefer a lemonade-like drink → Clear Whey (WPI)
Example of a “clear” product: 7Nutrition Clear Whey Isolate 500g / 900g
Taste, solubility, texture – real differences in using WPC and WPI
Taste and texture – does WPI always taste worse?
No, WPI does not have to taste worse, but in practice many people notice a difference in “milkiness” and texture. This is mainly because WPC has more fat and lactose, which naturally create creaminess and a “shake-like” character. WPI is more purified, so it often tastes lighter, sometimes even less “dessert-like” (especially in versions with a very clean composition).
In practice, it looks like this:
- WPC: more like a classic smoothie/shake, creamy, “milky”, often better for oatmeal and desserts.
- WPI: lighter, less heavy, usually easier to drink after training.
- Clear Whey (WPI): is a completely different story - more of a drink (like lemonade), not a shake.
Mini-tip: test a smaller pack, before you buy 2 kg. Choose the liquid according to your goal: water = lighter and fewer calories, milk = more dessert-like, but more kcal.
When to take WPC or WPI? (morning, after training, at night)
After training
Both WPC and WPI work very well as quick post-workout protein. If you have a sensitive stomach after training or want the most “clean” serving of protein, WPI will usually be more convenient.
During the day
This is the most common use of the supplement: simply when you are not getting enough protein from food. WPC is often the No. 1 choice here, because it is cheaper, tastier and more versatile (e.g. for oatmeal, pancakes, yoghurt).
In the evening/at night
WPC/WPI can also be drunk in the evening, but if you want protein “for longer”, a slow-absorbing option works better - casein.
How much protein per day do you need, and how many servings of a supplement make sense?
A protein supplement is an addition, not a substitute for a normal diet. First, it is worth calculating how much protein you actually get from food (meat, dairy, eggs, fish, tofu, legumes), and only then choosing a supplement.
In most cases 1 serving per day is completely OK, if you are not hitting your intake from meals. Sometimes 2 servings make sense, but usually this only happens with very high needs or a low amount of food.
A simple formula you can use: body weight × X g protein per day
(X depends on your goal and activity - the more strength training and cutting, the higher it usually is, e.g. 2g).
Most common mistakes when choosing WPC/WPI
7 mistakes that make protein “not work”:
- Buying WPI “because more expensive = better”, even though you do not need it
- Mixing by eye and “burning through” calories with extras (milk, peanut butter, syrups)
- Lack of consistency - protein in the diet is there one day, and not there the next
- Turning the supplement into “meal 0” instead of support (and neglecting normal food)
- Ignoring lactose intolerance
- Drinking a shake instead of normal meals all day
- Choosing a flavour without testing it
Recommended 7Nutrition proteins – what to choose
Below are quick, specific 7Nutrition recommendations tailored to the most common needs. These are not “magic” supplements - just well-matched WPC/WPI variants for different goals and preferences.
Best WPC for everyday use
7Nutrition Whey Protein 80 500g/2000g (WPC)
A classic whey concentrate that works as an everyday protein: for shakes, oatmeal, pancakes and desserts.
Best WPI for demanding users
7Nutrition Whey Isolate 90 500g/1000g / 2000g
Isolate for people who want “cleaner” macros, less lactose and a lighter form of protein - especially when cutting or with a sensitive stomach.
Best option if you are looking for something other than a shake
7Nutrition Clear Whey Isolate 500g/900g
If you do not like milky shakes, clear whey is a great alternative: protein in the form of a light, refreshing drink.
If you want a protein blend
A good solution if you want a combination of different protein fractions (often chosen as a more “meal-like” protein).
FAQ – WPC vs WPI (most common questions)
1. Does WPI contain lactose?
Yes, but usually a minimal amount. In practice, many people with lactose intolerance tolerate WPI better than WPC, although the reaction can be individual.
2. Is WPC worse than WPI?
No. WPC is simply less purified and has slightly more lactose/fat - but it is still a complete protein.
3. What is better after training: WPC or WPI?
Both are OK. If you want a “lighter” option or have a sensitive stomach, WPI more often comes out on top.
4. Is WPI good for cutting?
Yes, because it usually has more protein per serving and less fat and lactose. This makes it easier to hit macros and calories.
5. Does protein make you gain mass?
Not from protein alone. Body mass increases mainly due to a calorie surplus, and protein simply helps build muscle and recover.
6. Can you drink protein every day?
Yes, if you treat it as an addition to your diet. The most important thing is to still base your diet on normal food.
7. WPC 80 vs WPI 90 - what is the difference?
In simple terms: WPC 80 usually has approx. 70–80% protein, and WPI 90 usually 85–90%+. WPI also has less lactose and fat.
8. Does protein cause acne?
It is individual. In some people, dairy products (including whey) may worsen skin problems, but this is not a rule for everyone.
9. What to choose for bloating after protein?
Most often, it is worth testing WPI (less lactose) or clear whey. If the problem remains, the cause may also be the sweetener or a serving that is too large.
10. What is Clear Whey Isolate?
It is whey isolate in the form of a “drink”, rather than a milky shake. After mixing, it is more like lemonade than a shake.
Summary – which protein to choose?
WPC = versatile and economical
Good for everyday use, for bulking and as a “first protein”.
Great for cooking and desserts.
WPI = clean and light
More convenient when cutting, with a sensitive stomach and when you watch your macros.
Less lactose and fat, a “cleaner” serving of protein.
The most important thing is still one thing: regular protein intake from the whole diet (and the supplement is only meant to help you reach the goal).
See 7Nutrition protein supplements and choose the form suited to your goal.
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Paulina Sławińska
Dietitian
