Protein powder: what to look for on the label

Start with the Supplement Facts panel, the ingredient list and an independent testing mark — not a front-of-tub claim. FDA does not approve dietary supplements for safety or effectiveness before they are sold. A recognizable NSF Certified for Sport or USP Verified mark, confirmed in that certifier’s current database, is a way to check labeled contents and, in the sport program, certain banned substances. This is not medical advice, and it is not a reason to buy a powder.

• Anyone looking for medical advice, a meal plan or a dose. We will not provide those. A clinician or registered dietitian should.
• People shopping for a whey-versus-plant verdict. That is a different page, and this one does not pick a source.
• Anyone with a milk, soy or other food allergy who will not read the allergen and ingredient lines. FDA requires labeling, but you still have to use it.
• People who want a product FDA-approved to treat a disease. FDA’s pages say supplements are not approved as drugs before sale.
• Teenagers, people who are pregnant, and anyone with a medical condition or prescription medicines, unless a clinician has already been involved.

The NIH ODS consumer fact sheet on dietary supplements for exercise and athletic performance, updated March 22, 2021, discusses protein as one of several ingredients people use around training. It notes that protein is already available from food, and it summarizes research on supplemental protein in the context of exercise. The same sheet also recites amounts that have appeared in studies and in sports-nutrition discussions. We are not recommending those amounts, and you should not treat a fact-sheet summary or a study protocol as a personal target. Whether you need a powder at all depends on your diet and your health — questions for a clinician or dietitian, not for a buying guide.

FDA’s “FDA 101: Dietary Supplements” page and its questions-and-answers page both state that the agency does not approve dietary supplements for safety and effectiveness, or approve their labeling, before they are sold. Manufacturers are responsible for product safety and for truthful labeling. A product sold as a dietary supplement must carry a Supplement Facts panel that lists serving size, servings per container, and the dietary ingredients and amounts per serving, plus a domestic contact for serious adverse-event reporting. Serving size is chosen by the manufacturer and does not require FDA approval, so two tubs with the same “protein” claim can still list different grams per scoop. FDA also says supplements should not replace a varied diet or a prescribed medicine. If a powder is marketed to diagnose, treat, cure or prevent a disease, FDA treats it as a drug.

NSF’s Certified for Sport page says certified products are tested for substances banned by major sporting organizations, with formulation and label review, facility inspections and ongoing monitoring. USP’s Dietary Supplement Verification Program page says the Verified mark means the product contains the labeled ingredients in the stated amounts, does not have harmful levels of specified contaminants, is made under FDA current Good Manufacturing Practices, and dissolves or disintegrates properly. Neither mark is an FDA approval or a medical endorsement.

• Confirm it is labeled as a dietary supplement and has a Supplement Facts panel.
• Read the protein amount per serving and the serving size, then compare those two numbers rather than the marketing scoop count.
• Read the ingredient and allergen lines for milk, soy or other ingredients you need to avoid.
• Look for a recognizable NSF Certified for Sport or USP Verified mark, and check the product in that certifier’s current database.
• Talk with a clinician before using it, especially if you have a health condition, a food allergy or a reason to limit protein intake.