Protein powder is one of the most common products on fitness shelves, and one of the most confusing to compare. Tubs come in different sizes, scoops hold different amounts, and the protein per serving varies widely. Front labels highlight big numbers; the useful facts are in the nutrition or supplement facts panel and the ingredient list. This guide explains the common types of protein powder and how to compare them on equal terms, especially by price per gram of protein. Our protein powder comparison table puts several products side by side.
This guide does not tell you whether you need protein powder or how much protein to eat. Many people meet their needs from food alone. If you have kidney disease or another medical condition, are pregnant or nursing, take medication or are under 18, talk to your doctor or a registered dietitian before using protein supplements.
Common protein types
- Whey concentrate: a dairy protein from milk. Contains some lactose and fat; protein percentage per scoop is usually lower than isolate.
- Whey isolate: further processed to remove more lactose and fat, so protein per gram of powder is typically higher. Often more expensive.
- Hydrolyzed whey: partly broken down during processing. Usually the most expensive form of whey.
- Casein: another milk protein that forms a thicker texture when mixed.
- Plant proteins: pea, soy, rice, hemp and others, often blended to combine their amino acid profiles. Suitable for people avoiding dairy.
- Egg white protein and collagen are also sold. Collagen has a different amino acid profile from most other proteins; compare it carefully if your goal is general protein intake.
Nutrition Facts or Supplement Facts?
In the US, some protein powders are sold as foods with a Nutrition Facts panel, others as dietary supplements with a Supplement Facts panel. Both list serving size and protein per serving; the layout differs. Our guide to reading a supplement label explains the supplement panel in detail.
Serving size and protein per serving
Look for three numbers:
- Serving size in grams (often shown as one or two scoops).
- Protein per serving in grams.
- Servings per container.
From the first two you can work out protein percentage: protein per serving divided by serving size. A 30-gram scoop with 24 grams of protein is 80 percent protein. A 40-gram scoop with 24 grams is 60 percent. The second contains more of other things, such as carbohydrates, fats, flavorings or added ingredients.
Scoop sizes differ, so "one scoop" is not a standard unit. Always compare by grams.
Price per gram of protein
This is the most useful number for comparing value:
Price per gram of protein = price of the container ÷ (protein per serving × servings per container)
Example with illustrative numbers: a tub costs 45 dollars, contains 30 servings, and each serving has 24 grams of protein. Total protein = 24 × 30 = 720 grams. Price per gram = 45 ÷ 720 ≈ 0.063 dollars, or about 6.3 cents per gram of protein.
Do the same for each product you are considering. Larger tubs are often cheaper per gram, but only if you will use them before the best-by date. Subscriptions and sales change the math; see subscription math for the general approach.
Ingredient list
The ingredient list shows what is in the powder beyond protein:
- Protein source should appear first.
- Sweeteners: sugar, sucralose, stevia, monk fruit, sugar alcohols and others. Check if you prefer to avoid certain sweeteners.
- Thickeners and emulsifiers such as gums and lecithin affect texture.
- Added ingredients such as creatine, vitamins, caffeine or herbal extracts. These change what you are buying; compare like with like. See creatine basics.
- "Proprietary blends" list ingredients without individual amounts, which makes comparison harder.
Allergens
Check the allergen statement for milk, soy, egg, tree nuts and other allergens, as well as "may contain" or shared-facility statements if you have serious allergies. Plant proteins are not automatically allergen-free; soy is a common allergen.
Third-party testing
Supplements are not approved by the FDA before sale. Independent testing programs check products for label accuracy and, in some programs, banned substances. Look for certification marks from recognized programs and verify them on the certifier's website. This is especially relevant for athletes subject to drug testing. See third-party testing explained.
Taste, mixing and practical use
Even a great value powder is a waste if you will not use it. Sample sizes or small tubs help test flavor and mixability. Mixing with water, milk or a plant drink changes taste, texture and total nutrition. Write down the total for your usual mix if you track intake.
Comparing two products side by side
A quick way to compare two tubs is to write down, for each: protein type, serving size in grams, protein per serving, protein percentage, servings per container, price, price per gram of protein, main sweetener, allergens and any third-party certification. Laying these out in a small table, or using our comparison tool, often shows that a product with a bigger front-of-pack number is not the better value once serving size is accounted for. Recheck the label when you reorder, since recipes and tub sizes change.
Reading front-of-pack claims
Phrases such as "high protein", "lean" or "pure" are marketing language. Check them against the panel: protein per serving, protein percentage and the ingredient list tell you more than any slogan.
Storage
Keep tubs sealed in a cool, dry place. Humidity can cause clumping. Check the best-by date and use the scoop provided, keeping it dry.
Quick checklist
- Compare protein type and protein percentage.
- Calculate price per gram of protein.
- Read the ingredient list for sweeteners and additions.
- Check allergens.
- Look for verified third-party testing.
- Start with a small size to test taste.
Common questions
Is more protein per scoop always better?
Not necessarily. It depends on what you want from the product. Higher protein percentage means fewer other ingredients per scoop, which may or may not matter to you.
Are plant proteins lower quality?
Plant proteins differ in amino acid profiles. Blends are common to balance this. Whether a product suits you is a question for your dietitian or doctor.
About this guide
Our supplement guides explain labels, testing programs and terms so you can ask better questions. We don’t make disease or treatment claims, we haven’t hands-on tested products, and we don’t publish invented statistics or ratings. Product facts come from official brand pages and certifier listings. How we work.