Whey isolate vs concentrate: is isolate worth it? Price per 25 g protein
· 3 min read · By Value Servings
Isolate vs concentrate
| Whey concentrate (WPC80) | Whey isolate (WPI) | |
|---|---|---|
| Protein by weight | about 70–80% | 90% or more |
| Lactose per serving | a few grams | usually under 1 g |
| Fat and carbs | a little more | very little |
| Mixes | fine | thinner, clearer |
| Price per gram of protein | lower | usually higher |
Both are complete proteins, high in leucine, and digest quickly. Studies do not show isolate building more muscle than concentrate at the same protein dose.
Many "whey protein" tubs are blends of concentrate and isolate. The ingredient list is in order of weight; if concentrate comes first, the tub is mostly concentrate, whatever the front says.
Price per 25 g of protein
Scoop sizes vary from 25 g to 45 g of powder, and protein per scoop varies from about 20 g to 30 g. The only fair comparison is price per gram of protein. Our list uses 25 g of protein:
| Product | Store | Per 25 g protein | vs Optimum Nutrition |
|---|---|---|---|
| ALLMAX Isoflex: 100% Whey Protein Isolate · 5 lb · Vanilla | ALLMAX | $1.72 | 27% less |
| Transparent Labs Grass-Fed Whey Protein Isolate · 4LB · Unflavored | Transparent Labs | $1.73 | 26% less |
| Jacked Factory Authentic Iso, Whey Protein Isolate · 25 Servings · Vanilla Oatmeal Cookie | Jacked Factory | $1.80 | 23% less |
| NutraBio Whey Protein Isolate Powder · 50 Servings · Unflavored | NutraBio | $2.20 | 6% less |
| Optimum Nutrition Gold Standard 100% Isolate Whey Protein powder · Chocolate Bliss · 44 Servings popular brand | Optimum Nutrition | $2.35 | — |
Prices checked September 23, 2026. Store prices change; the price at checkout is final. See the full whey isolate list
Who should pay for isolate
- Lactose sensitive: if concentrate gives you gas or bloating, isolate often fixes it. People with milk protein allergy should avoid whey entirely.
- Strict dieting: a few grams of carbs and fat per serving matter to some people.
- Taste and mix: isolate mixes thinner, and unflavored isolate disappears into other foods more easily.
Otherwise, concentrate or a blend is the better value.
Label checks
- Protein per scoop vs scoop weight. A 30 g scoop with 27 g protein is a high-protein isolate. A 40 g scoop with 24 g protein has a lot of other stuff.
- Amino spiking. Some products in the past added cheap amino acids like glycine or taurine, which raised the protein number on the label without adding real whey protein. Look for added free amino acids in the ingredients.
- Reformulations. Brands change recipes and flavors. If a trusted tub suddenly tastes or mixes differently, check whether the label changed.
- Third-party testing. NSF Certified for Sport and Informed Choice/Informed Sport are common on protein. Tested athletes should buy certified products.
How much protein
For people who exercise regularly, the International Society of Sports Nutrition suggests about 1.4–2.0 g of protein per kg of body weight a day, from all foods. Powder is a convenient way to fill a gap, not a requirement. A serving of 20–40 g is common.
Frequently asked questions
Is whey isolate worth the extra money?
If lactose bothers you, or you want the least carbs and fat per gram of protein, yes. For muscle alone, concentrate works as well at the same protein dose and costs less.
Does whey isolate have lactose?
Very little, usually under 1 g per serving. Most people with lactose intolerance tolerate it, but people with a milk protein allergy should avoid all whey.
How do I compare protein powder prices?
Divide the tub price by total grams of protein (protein per scoop × servings), then multiply by 25 for the price per 25 g of protein.
Is collagen a good substitute for whey?
No. Collagen is an incomplete protein. See is collagen worth it?.
Sources
Compare whey isolate per 25 g proteinEvery price on the list is worked out the same way, and checked daily.
This is general information about prices and labels, not medical advice. Ask a doctor or pharmacist before starting a supplement, especially if you are pregnant, take medication, or have a health condition. We don't sell the products; how we make money.