Reading a Protein Powder Ingredient List: How to Interpret the Details

In the European Union, ingredients must be listed in descending order of their share by weight. This means the ingredient named first makes up the largest share by quantity. In a classic protein powder, the protein source itself is usually listed first, such as whey protein concentrate, whey protein isolate, pea protein or a blend of several protein sources. If sweeteners, flavourings or fats follow early on, it is worth taking a closer look at the nutrition table.

Protein content is usually stated on the nutrition table per 100 g of powder. For the actual amount of protein per serving, you convert this value to the stated serving size. With about 80 g of protein per 100 g of powder and a serving of 30 g, the calculation gives a protein amount of about 24 g per serving. Comparing protein content per 100 g between different products is usually more informative than comparing serving size alone, since this is defined differently from manufacturer to manufacturer.

Many protein powders contain sweeteners to achieve a sweet taste with little or no sugar. Commonly used are, for example, steviol glycosides, sucralose or acesulfame K, which must be listed in the ingredient list by name or by E number. If a reduced-sugar or sugar-free recipe matters to you, it is worth looking at the sugar content in the nutrition table and at the ingredient list to see which sweetener is used. You can find more background in the glossary entry Sweeteners in Powder.

Flavours such as chocolate, vanilla or strawberry usually come from added flavourings, which are listed in the ingredient list as "flavouring" or with a more specific description. Thickeners such as guar gum, xanthan or cellulose provide a creamier texture when mixed and are used in fairly small amounts. Both groups of ingredients are approved for use in food in the European Union and are regarded as generally safe at the maximum levels prescribed in each case.

The Nutri-Score is a voluntary labelling system that sorts foods into classes from A to E based on nutritional profiles. For protein powders the Nutri-Score can be misleading, because the system was originally developed for comparison within similar product groups and does not always represent food supplements or highly concentrated products optimally. A high protein content has a positive effect, while the share of sugar or fat and, where relevant, sweeteners can influence the score. Use the Nutri-Score therefore as an additional pointer rather than as the sole decision criterion.

You can find further guidance on choosing in our buying guide and in the protein powder comparison.

Why do serving sizes differ between manufacturers?

Each manufacturer sets the serving size itself, and it is not uniformly regulated. A comparison based on protein content per 100 g is therefore often more informative.

Are sweeteners in protein powder a concern?

The sweeteners approved in the European Union are regarded as generally safe at the prescribed maximum levels. If you want to avoid sweeteners, you can look specifically for unsweetened varieties.

What does a low Nutri-Score mean for protein powder?

A low Nutri-Score does not automatically mean a product is unsuitable, since the system is only of limited use for food supplements. Protein content and the ingredient list often give better guidance.

How can I reliably recognise amino acid spiking?

There is no one hundred percent reliable indicator from the ingredient list alone. Conspicuously placed free amino acids in the list can, however, be a hint that makes a closer comparison with other products worthwhile.