How to read a protein label: serving size, grams and the milk line
Nutriens editors
A protein tub's front label is mostly big numbers and adjectives. The panel and ingredient list on the back tell you what you are actually drinking. Here is how to read them, in order, using our own Protein Strength as the worked example. The first fact, before anything else: it is whey, so it contains milk.
1. Serving size: scoops and grams
Every number on the panel is per serving, and a serving can be more than one scoop. Protein Strength's serving is 2 scoops: 34 g for Vanilla, 35 g for Chocolate. A tub holds 24 servings, so it lasts 24 days at one shake a day.
Check the grams, not just the scoops. Scoops differ between brands; grams let you compare one tub with another.
2. Protein per serving, and per gram of powder
Protein Strength has 22 g of protein per serving in both flavors. A quick sum tells you more: divide protein by serving weight. 22 g in 34 g is about 65% protein for Vanilla; 22 g in 35 g is about 63% for Chocolate. The rest is flavor and texture: cocoa, MCT oil powder, apple pectin, sunflower lecithin, stevia and sea salt.
Use the same sum on any tub. A big protein number paired with a very large serving can be less impressive than it looks.
3. The whole panel
| Per serving | Vanilla | Chocolate |
|---|---|---|
| Serving size | 2 scoops (34 g) | 2 scoops (35 g) |
| Calories | 120 | 120 |
| Protein | 22 g | 22 g |
| Total fat | 1 g | 1.5 g |
| Total carbohydrates | 5 g (2 g total sugars) | 4 g (1 g dietary fiber) |
| Sodium | 115 mg | 180 mg |
| Servings per tub | 24 | 24 |
| Allergen | Contains milk | Contains milk |
The protein line shows "***" in the %DV column because no Daily Value is set for it on this panel. The small amounts of calcium, potassium and other minerals are listed as measured in the powder.
4. The ingredient list, in order of weight
Ingredients are listed from most to least by weight. On Protein Strength Vanilla: whey protein isolate, natural flavors, MCT oil powder, apple pectin powder, sunflower lecithin, stevia extract (leaf), sea salt, silicon dioxide. Chocolate adds two cocoa powders. Three things to look for on any tub:
- Which protein, and which comes first. Isolate, concentrate, hydrolysate, or a mix. Whey isolate vs concentrate explains the difference.
- Added single amino acids. Protein is usually measured from nitrogen, and free amino acids such as glycine or taurine add nitrogen too. When they are added to a protein powder, the protein number can look higher than the complete protein inside. Protein Strength's only protein source is whey protein isolate, with no added amino acids.
- Blends without amounts. A "matrix" or "complex" with one total hides how much of each protein you get.
5. Sweeteners and sugar
Check the sweetener in the ingredient list and the sugar line on the panel. Protein Strength is sweetened with stevia leaf extract; Vanilla shows 2 g total sugars and Chocolate 1 g of dietary fiber. No sugar alcohols are listed. If a tub lists sugar alcohols such as erythritol or sorbitol, know that some people's stomachs notice them.
6. The allergen line
Milk is one of the major food allergens that U.S. law requires labels to declare. Any whey product must declare milk, usually in a "Contains milk" line, and Protein Strength does, in both flavors. That means it isn't vegan and isn't dairy-free. If you have a milk allergy, stop here. If you are lactose intolerant, the label prints no lactose figure, so ask your doctor before trying any whey.
7. Directions
Protein Strength's label says 2 scoops in 6 to 8 oz of water or another drink, once a day. For best results it suggests 20 to 30 minutes before a meal, with 8 oz of water.
What a label can't tell you
It can't tell you how much protein you need. For adults, the Recommended Dietary Allowance is 0.8 g per kilogram of body weight a day. The ISSN position stand on protein suggests 1.4 to 2.0 g per kilogram for most people who exercise, spread across the day in servings of roughly 20 to 40 g. Food should do most of that work; a shake fills a gap.
And skip any tub that sells a body instead of a panel: hormone-style hype, before-and-after photos, or a blend with no grams.
Where to go next
How to fit a shake into your week: the Protein Strength routine. Short answers: the Protein Strength FAQ. Where protein goes missing: 7 ways people miss protein. The general version of this guide, for any supplement: how to read a label like a pro.
References
- U.S. Food and Drug Administration. "Dietary Supplement Labeling Guide." fda.gov
- U.S. Food and Drug Administration. "Food Allergies: What You Need to Know." Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA).
- Jäger R, Kerksick CM, Campbell BI, et al. "International Society of Sports Nutrition Position Stand: protein and exercise." Journal of the International Society of Sports Nutrition. 2017;14:20.
- Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids. National Academies Press, 2005.
- Protein Strength Vanilla and Chocolate labels: nutrition panel, ingredients, allergen statement and directions.
