Comparing whey protein products comes down to five checks: the protein type (concentrate, isolate, or hydrolysate), the protein content per 100 g and per serving, the ingredient list for fillers or added amino acids, the cost per gram of protein delivered rather than per tub, and whether flavoured or unflavoured suits how you’ll use it. Get these right and the front-of-pack marketing matters far less.
What’s the difference between whey concentrate, isolate, and hydrolysate?
Concentrate typically runs 70-80% protein by weight, keeping more of the naturally occurring fat and lactose; isolate is filtered further to roughly 90%+ protein with most fat and lactose removed; hydrolysate is pre-broken into smaller peptides. All three supply a similar amino acid profile — the real differences are purity, lactose content, and price per gram of protein.
Concentrate is usually the best value per gram of protein and suits most people without a lactose sensitivity. Isolate is worth the extra cost mainly if you’re managing lactose intolerance or want a leaner macro profile with less carbohydrate and fat per scoop. Hydrolysate costs more again and tastes more bitter; it’s sometimes marketed for use around training due to its smaller peptide size, but for general daily protein intake it offers no advantage over concentrate or isolate that most gym-goers would notice.
None of the three formats changes what protein does in the body: protein contributes to the maintenance of muscle mass. The format only affects how you reach your daily protein target, not whether you need it. Browse the full range of whey protein options to compare formats side by side.
How should you read protein per 100 g and per serving?
EU/UK labels must state protein per 100 g, and most also show it per serving — usually a 25-33 g scoop. Use the per-100g figure to judge how concentrated the protein source is, but always work out what a single serving actually delivers, since serving sizes vary between brands and a larger scoop can make a lower-protein blend look competitive.
Do the maths yourself rather than trusting the headline number on the front of the tub. A product listing 78 g protein per 100 g sounds strong until you check that the recommended serving is only 25 g — that works out to roughly 19.5 g protein per scoop, noticeably lower than a product delivering 24-27 g per serving at a similar per-100g figure. This single calculation is the fastest way to see through inflated front-of-pack claims.
What ingredient list red flags should you watch for?
Watch for gums or thickeners listed near the top of the ingredients, ahead of the protein source; free-form amino acids such as glycine, taurine, or glutamine positioned unusually high on the list; and large amounts of maltodextrin or other carbohydrate fillers bulking out the blend. Any of these can mean you’re paying whey prices for something that isn’t mostly whey.
- Amino spiking: adding cheap free-form amino acids to inflate the total nitrogen (and therefore the labelled protein) content without actually adding whey. If amino acids appear high on the ingredient list of a “protein” product rather than as a standalone supplement, treat the protein-per-serving figure with caution.
- Thickeners and gums: small amounts of xanthan gum, guar gum, or lecithin for texture are normal; several appearing before the protein source is a sign of a diluted blend.
- Vague “protein blend” labelling: where the source is disclosed only as a blend without individual percentages, you can’t verify how much is whey versus cheaper filler proteins.
How do you work out true value per serving?
Value per serving is cost divided by the grams of protein actually delivered per serving — not the price of the tub and not the price per kilogram of powder. Two products priced the same per kilogram can differ substantially in protein delivered once you account for serving size, purity, and how much of the blend is filler.
To compare fairly: divide the total protein delivered across the whole tub (servings × protein per serving) by the price, then compare that per-gram-of-protein figure across products rather than comparing tub prices directly. A cheaper-looking tub with a lower protein percentage and larger recommended serving can end up costing more per gram of actual protein than a pricier isolate that delivers more protein per scoop. This is the only reliable way to compare across concentrate, isolate, and hydrolysate on a level footing.
Should you choose flavoured or unflavoured whey?
Flavoured whey is easier to drink consistently mixed with just water or milk, which matters most if consistency is your biggest challenge; unflavoured whey blends into oats, yoghurt, soups, or baking without altering the taste and gives you full control over any added sweetness. Neither is nutritionally superior — the right choice depends on how and where you’ll use it.
Flavoured versions typically use sweeteners such as stevia or sucralose, which some people prefer to avoid or are simply sensitive to; if that’s you, unflavoured is worth checking instead. If shakes aren’t appealing at all, a protein bar can be a more practical way to hit the same daily target, and pairing your choice with the right timing around training is covered in our pre- and post-workout nutrition range.
Do you actually need whey protein powder at all?
Whey protein is a convenient way to help meet a daily protein target, but it isn’t essential: whole foods such as dairy, eggs, poultry, fish, and legumes supply the same amino acids, often with nutrients whey doesn’t provide. A powder earns its place mainly when your schedule or appetite makes it genuinely difficult to reach your target through meals alone.
Protein contributes to the maintenance of muscle mass, and protein contributes to the maintenance of normal bones; what drives those outcomes is your total daily protein intake, not the specific source. If you’re already comfortably meeting your target from food, an additional shake adds cost without adding benefit. Anyone pregnant, breastfeeding, managing a medical condition, or taking medication should check with a doctor or registered dietitian before significantly increasing protein intake or starting any new supplement.
Frequently asked questions
These quick answers cover the questions that come up most often when comparing whey protein products: whether a higher protein percentage is automatically better, whether a shake can stand in for a proper meal, and what a normal serving should actually deliver in grams of protein. Use them alongside the checks above when comparing labels.
Is a higher protein percentage always better?
Not necessarily. A high percentage from isolate matters most if you’re managing lactose intolerance or want less carbohydrate and fat per scoop; for most gym-goers, concentrate’s 70-80% protein is perfectly adequate and usually better value per gram of protein. Daily consistency matters more than the last few percentage points of purity.
Can whey protein replace whole food meals?
No. Whey protein is a supplement, not a meal replacement — it lacks the fibre, micronutrients, and variety that whole foods provide. It’s best used to help close a gap between food intake and your daily protein target, particularly around training. Check with a healthcare professional before changing your diet significantly if you have a medical condition.
How much protein per serving should I look for?
Most whey products deliver roughly 20-30 g protein per serving, in line with a typical per-meal protein amount for an active adult. Rather than chasing the single highest number on the label, check that figure is achieved without an oversized scoop, and that it fits sensibly into your total daily protein target.
