Whey is the workhorse of the supplement shelf: the tub most people buy first and keep coming back to. It’s also where the labels get noisy. Concentrate, isolate, hydrolysed, “clear”, blends, 2kg tubs and 900g pouches, each claiming to be the one you need.
This guide strips it back to what actually separates one whey from another: how much protein you get per scoop, what else comes with it, how it tastes and mixes, and what each serving really costs. It’s written for anyone who trains, whatever your gender. It’s general information, not personal advice.
What whey protein is (and what it does)
Whey is one of the two main proteins in milk; the other is casein. When milk is made into cheese, the liquid whey is filtered and dried into the powder in your tub. Protein itself has authorised claims in the UK:
The authorised claims
Protein contributes to a growth in muscle mass. Protein contributes to the maintenance of muscle mass. Protein contributes to the maintenance of normal bones.
Those claims are on the GB nutrition and health claims register, and they apply to protein from any source: chicken, eggs, beans or a shake. Whey is simply a convenient, measurable way to add protein to your day. It doesn’t do the training for you, so be wary of any tub that promises more than that.
Concentrate, isolate or blend?
All three are whey. The difference is how far the whey has been filtered, which changes how much of each scoop is protein and how much is the natural milk fat and lactose that come with it.
Whey concentrate: the everyday choice
Whey concentrate is filtered less, so it keeps a little more of the milk’s natural fat and lactose. That usually means a creamier, fuller taste and the lowest price per serving. A typical concentrate is around 70–80% protein by weight. If you tolerate dairy well and want value, this is the place to start.
Whey isolate: more protein per scoop
Whey isolate is filtered further, so it’s typically 85–90% protein or more, with less fat, carbohydrate and lactose. You pay more per tub for that. Isolate suits people who track their macros closely or find that concentrate sits heavily. Lower in lactose doesn’t mean lactose-free, so check the label if lactose is a concern.
Whey blends: the middle ground
Many of the best-known tubs are blends of concentrate and isolate, sometimes with hydrolysed whey or milk protein added. Ingredients are listed in order of weight, so the first protein on the list makes up most of the blend. Blends balance taste, protein per scoop and price, which is why so many people settle on one.
Hydrolysed and clear whey
Hydrolysed whey has been partly broken down during processing. Clear whey is usually made from isolate or hydrolysed isolate and mixed into a light, juice-like drink rather than a milkshake. It’s a good pick if thick shakes aren’t for you, especially in warm weather. It typically costs more per serving.
| If you want… | Choose |
|---|---|
| The best value per serving | Whey concentrate |
| The most protein per scoop, less fat and carbs | Whey isolate |
| A good all-rounder for taste and macros | A concentrate and isolate blend |
| A light, fruity drink instead of a milkshake | Clear whey |
| No dairy at all | A plant protein, not whey |
Our picks from the armoury
All in stock now. Prices are correct at the time of writing; the product page always shows the latest price and flavours. Protein per serving is taken from the brand’s label and can vary slightly by flavour.
How much protein do you need?
UK guidance for adults is 0.75g of protein per kilogram of body weight a day as a reference amount. Many people who train hard choose to eat more than this through their regular meals. Here’s how a shake fits in:
- Food first. A shake is a top-up to your meals, not a replacement for them.
- Count it in your day. One serving of whey typically gives 20–25g of protein. Add it to what you already eat rather than doubling up for the sake of it.
- Timing is about convenience. After training, at breakfast or as a snack: drink it when it helps you hit your daily total.
- Follow the label. Use the serving size on the pack and don’t exceed the recommended daily intake.
Cost per serving, worked out
Divide the price by the number of servings, and compare protein per serving rather than tub size. Using today’s prices, the DY Nutrition Shadowhey Concentrate 2kg works out at about 91p a serving, Applied Nutrition Critical Whey 2kg about £1.13, Optimum Nutrition Gold Standard 100% Whey 2.04kg about £1.25, and Applied Nutrition Iso-XP 850g about £1.41. Clear whey usually sits higher, around £1.60 a serving. Bigger tubs nearly always work out cheaper per scoop.
Who does whey suit?
Whey suits adults who want an easy way to add protein to their diet, for example:
- Strength training, powerlifting and bodybuilding
- Hybrid and functional fitness, such as Hyrox and CrossFit-style training
- Runners, cyclists and team-sport players who struggle to hit their protein from food alone
- Busy days when a proper meal isn’t practical
Whey isn’t a men’s supplement. The protein claims apply to adults whatever their gender. Women don’t need a special “for women” protein; a standard whey does the same job, so choose on taste, protein per serving and price.
Will whey make you bulky? Not on its own. Changes in muscle and body weight come from your overall training and total food intake, not from one shake.
Before you start
Whey is made from milk, so it is not suitable if you have a milk allergy, and it contains lactose unless the label says otherwise. Check every label for allergens such as milk, soy and gluten. If you are lactose intolerant, have a medical condition (including kidney problems), are pregnant or breastfeeding, or take any medication, seek medical or professional advice before use. Most protein powders are designed for adults. Don’t exceed the recommended daily intake on the label. Food supplements should not be used as a substitute for a varied, balanced diet and a healthy lifestyle.
Five label checks before you buy
- Protein per serving: compare grams of protein per serving, not scoop size or tub size.
- Protein source: the first protein in the ingredients is the main one. Look for “whey protein concentrate” or “whey protein isolate”.
- Servings per pack: use it to work out the real cost per serving.
- Other ingredients: sugars, sweeteners, thickeners and allergens.
- Testing marks: if you compete in tested sport, look for batch testing such as Informed Sport or Informed Protein.
Frequently asked questions
Is whey isolate better than concentrate?
Not better, just more filtered. Isolate gives more protein and less fat, carbs and lactose per scoop; concentrate is usually creamier and cheaper. Both count towards your daily protein in the same way.
What’s the best whey protein in the UK?
The best one is the one you’ll drink consistently at a price you’re happy with. For value, start with a concentrate. For tighter macros, choose an isolate. If you can’t decide, a well-known blend such as Optimum Nutrition Gold Standard 100% Whey 2.04kg is a popular first tub.
Can I mix whey with water or milk?
Either works. Water keeps the calories down and mixes lighter; milk makes it creamier and adds a little more protein. Clear whey is made to be mixed with water only.
Can I cook or bake with whey?
Yes. Whey works in porridge, pancakes and protein bakes. Stir it into oats once they’re cooked, as high heat can make it clump.
Is whey suitable for vegans?
No. Whey comes from milk. If you avoid dairy, look for pea, soy, rice or blended plant proteins in our protein range.
Shop the picks
The tubs compared in this guide, by type.
DY Nutrition Shadowhey Concentrate 2kg · £59.99
Concentrate, 23g protein per 30g serving, about 91p a serving.
Applied Nutrition Critical Whey 2kg · £68.95
Blend, 24g protein per 33g serving.
Optimum Nutrition Gold Standard 100% Whey 2.04kg · £84.99
Blend led by isolate, 24g protein per scoop.
Applied Nutrition Iso-XP 850g · £47.95
Isolate, around 22g protein per 25g serving.
Applied Nutrition Clear Whey 875g · £56.95
Clear whey, around 21g protein per 25g serving, mixed with water.
Free UK delivery over £80, otherwise £5.99.
Fuel the effort, then do the work
Whey is a simple, steady part of a routine; the training, food and sleep still do the heavy lifting. If you’re building a stack, read our creatine buyer’s guide next, or see why we put recovery before the stack.
