Most people buying protein powder look at one number: the protein grams per serving.
But the rest of the label tells you more about the product than that single number ever could.
Here's what to actually look for.
Start with the ingredients list
In the UK, ingredients are listed in descending order by weight. The first ingredient is the most abundant. The last is the least.
For a high-quality whey protein, the first ingredient should simply be whey protein - ideally whey protein concentrate or isolate. Nothing else should appear before it.
If the first few ingredients include things like maltodextrin, corn syrup solids, or sugar, you're paying for filler before you're paying for protein.
What are all those additives?
Most mainstream protein powders contain a long list of functional ingredients. Some are more problematic than others.
Artificial sweeteners (sucralose, acesulfame-K, aspartame)
Added to make the product palatable. Research on long-term gut microbiome impact is still emerging, but a 2022 study published in Cell found that some non-nutritive sweeteners - including sucralose and saccharin — altered gut microbiota composition and glucose tolerance in human subjects.
Gums and thickeners (xanthan gum, carrageenan, guar gum)
Used to improve texture and mixability. Generally regarded as safe in small quantities, though some individuals report digestive sensitivity. If you're using protein powder daily, cumulative intake is worth considering.
Maltodextrin
A highly processed carbohydrate used as a filler and carrier. It has a glycaemic index higher than table sugar. It adds calories without meaningful nutritional value.
Artificial flavourings and colours
These vary enormously by brand. Some are benign. Others are proprietary blends you cannot identify by name.
What a short label tells you
A protein powder with a short ingredient list - three, four, maybe five ingredients - isn't a compromise. It's a choice.
It means the manufacturer hasn't needed to mask poor-tasting base ingredients with flavour systems. It means they're not adding bulk. It means you can read the label and know exactly what you're putting in your body.
For a product you might use every day, that matters.
The organic question
Organic certification in the UK (and EU) means the dairy source meets specific standards: no synthetic pesticides in feed, restrictions on antibiotic use, and higher animal welfare requirements.
For whey specifically, this matters because whey is derived from milk - and what goes into the cow affects what ends up in the concentrate. A 2016 study in the British Journal of Nutrition found that organic milk contained significantly higher levels of omega-3 fatty acids compared to conventional milk, reflecting differences in diet and farming practice.
A quick label checklist
• First ingredient: whey protein concentrate or isolate
• No maltodextrin
• Sweeteners: natural or none at all
• No artificial colours
• You can read and recognise every ingredient
You don't need a chemistry degree to read a protein label. You just need to know what you're looking for.
Short is usually better. Clean is always better. And if you wouldn't be comfortable feeding it to your kids, it's probably worth asking why you're comfortable feeding it to yourself.
