Free tool · Cantein Research
Protein Powder Ingredient Checker
Search popular protein powders by brand, or paste any ingredient list. See which sweeteners, allergens, gums, and added fibers are in it, why each ingredient is there, and what’s worth knowing about it.
popular powders, each list copied from the brand’s own product page. Not listed? Paste the label below.
Runs in your browser. Nothing you paste is sent anywhere. The whey and plant examples are typical labels, not specific products.
How it works
A label check in three steps
Cantein’s Protein Powder Ingredient Checker is a free tool that reads an ingredient list the way the FDA says it has to be written, and tells you which common sweeteners, allergens, and additives are in it.
Find or paste the list
Search by brand, or copy the list from the tub or the brand’s product page. Include the “Contains” line if there is one.
It reads every part
Blends in parentheses, the “2% or less” group, and the allergen statement are each handled separately.
See what’s in it
An 11-point checklist, why each ingredient is used and what’s worth knowing about it, and a guide for anything you want to avoid.
Reference
What the checker looks for
| Check | Label names it catches | What it is |
|---|---|---|
| Sucralose | Sucralose | An artificial sweetener approved by the FDA as a food additive. Powders without it |
| Other artificial sweeteners | Acesulfame potassium (ace-K), aspartame, saccharin, neotame, advantame | The other five high-intensity sweeteners the FDA has approved |
| Stevia | Stevia leaf extract, steviol glycosides, Reb A, Reb M, Reb D | Purified extracts of the stevia leaf. Powders without it |
| Sugar alcohols | Erythritol, xylitol, maltitol, sorbitol, mannitol, isomalt, lactitol | Partly absorbed sweeteners that can cause gas and laxative effects |
| Added sugar | Cane or coconut sugar, dextrose, fructose, honey, syrups, agave | Sugars and syrups; grams are on the label as Added Sugars |
| Dairy | Whey, casein, caseinates, milk protein, milk, lactose, cream | Milk ingredients. Dairy-free powders |
| Soy | Soy protein, soy lecithin, soybean | A major food allergen |
| Pea or legumes | Pea protein, chickpea, lentil, fava, mung bean | Legume proteins. Pea alternatives |
| Gums | Xanthan, guar, acacia or gum arabic, cellulose gum, carrageenan, gellan, locust bean | Thickeners for texture |
| Added fiber | Inulin, chicory root, FOS, oligofructose, polydextrose, resistant dextrin, acacia, psyllium | Fibers added to the formula. Why some cause gas |
| Added colors | Red 40, Yellow 5, caramel color, titanium dioxide, carmine, annatto | Color additives |
It also lists, without counting them on the checklist: monk fruit, allulose, the other major allergens (egg, wheat, peanut, tree nuts, sesame, fish, shellfish), coconut and MCT, flavors, and maltodextrin and starches.
Label rules
How to read a protein powder label
- Heaviest first. Ingredients are listed in descending order by weight, so the first one or two are usually the protein.
- Except the “2% or less” group. After a statement like “Contains 2% or less of,” ingredients can be in any order. Sweeteners, gums, and flavors often sit here.
- Blends in parentheses list what the blend is made of. “Protein blend (whey isolate, whey concentrate)” is two ingredients.
- Allergens are declared one of two ways: in parentheses after the ingredient, as in “lecithin (soy),” or in a “Contains” statement next to the list.
- “May contain” and “made in a facility that also processes” are advisory statements. The law doesn’t require them, but they have to be truthful.
- Supplement labels are split in two. Many protein powders are sold as dietary supplements, with a Supplement Facts panel and an “Other ingredients” list. Ingredients named in the panel don’t have to be repeated in the list, so paste both.
Limits
What a label can’t tell you
A short ingredient list says nothing about contamination. Heavy metals like lead and cadmium aren’t ingredients, so they never appear on a label, and only lab testing shows them.
Ask a brand for its lab results if they aren’t published. Our guide to lead in protein powder explains the limits and how to convert parts per billion into micrograms per scoop, and how Cantein is made and tested shows our Eurofins results.
FAQ
Frequently asked questions
How does the protein powder ingredient checker work?
Search for a popular powder or paste any ingredient list. The checker splits the list at commas, opens up blends in parentheses, sets aside the “Contains” and “may contain” statements, and matches each ingredient against the label names in the table on this page. Then it explains why each ingredient is used and what’s worth knowing about it. It runs in your browser, and nothing you paste is sent or saved.
Is monk fruit the same as stevia?
No. Both are purified plant extracts that the FDA treats as generally recognized as safe, but they come from different plants: monk fruit from a melon-like fruit native to southern China, stevia from the leaves of the stevia plant. The checker lists monk fruit separately and doesn’t count it as stevia or as an artificial sweetener. How each sweetener is regulated.
What are sugar alcohols on a protein powder label?
Erythritol, xylitol, maltitol, sorbitol, mannitol, isomalt, and lactitol. They are only partly absorbed, and a systematic review found dose-dependent gas, discomfort, and laxative effects in some people. A “monk fruit sweetener” or “stevia blend” can be mostly erythritol, so read the full list.
What does “natural flavors” mean on a label?
Under FDA rules, a natural flavor is an extract, essence, or similar product from a plant, meat, seafood, eggs, dairy, or fermentation, whose job in the food is flavor rather than nutrition. The label doesn’t have to name the source, but a major allergen such as milk still has to be declared.
Why are ingredients listed in that order?
US labels list ingredients by weight, heaviest first. The exception is ingredients at 2% or less: after a statement like “Contains 2% or less of,” they can be listed in any order. Sweeteners, gums, and flavors are often in that group because they are used in small amounts.
Can a label tell me if a protein powder has heavy metals?
No. Lead, cadmium, and arsenic aren’t ingredients, so they never appear on the ingredient list. Only lab testing shows them. Some brands publish their results; ask for them if a brand doesn’t. Lead in protein powder.
Where do the product ingredient lists come from?
Each one is copied from the brand’s own product page, and the checker shows the link and the date we checked it. Formulas change, so the label on your tub is the final word. Cantein’s own powders are in the list too. If a product isn’t there, paste its ingredient list.
Is this medical or allergy advice?
No. The checker reads the words on a label and can miss unusual names, typos, or ingredients a label doesn’t list. If you have a food allergy, read the full label and ask the manufacturer. “May contain” and “made in a facility” statements are voluntary, so their absence doesn’t rule out cross-contact.
Source library
Sources
- US Food and Drug Administration. 21 CFR 101.4, food labeling: designation of ingredients.Electronic Code of Federal Regulations.
- US Food and Drug Administration. 21 CFR 101.22, foods: labeling of spices, flavorings, colorings and chemical preservatives.Electronic Code of Federal Regulations.
- US Food and Drug Administration. Food allergies: major food allergens and food labels.fda.gov.
- US Food and Drug Administration. High-intensity sweeteners.fda.gov.
- Lenhart A, Chey WD. A systematic review of the effects of polyols on gastrointestinal health and irritable bowel syndrome.Advances in Nutrition, 2017.
- Bonnema AL et al. Gastrointestinal tolerance of chicory inulin products.Journal of the American Dietetic Association, 2010.
- Cherbut C et al. Acacia gum is a bifidogenic dietary fibre with high digestive tolerance in healthy humans.Microbial Ecology in Health and Disease, 2003.
Not medical or allergy advice. The checker matches the words on a label against a list of known ingredient names. It can miss unusual names and can’t see anything a label leaves out. Cantein makes hemp protein powder, and our own labels are run through the same checks. Corrections and missing ingredient names: info@cantein.com.