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Every product here is scored on the same six criteria, equally weighted. We compare protein form, protein per serving, sugar per serving, sweetener type, sourcing, and cost per gram of protein rather than cost per jar.
You should know before you read the table that this site is published by EnergyFirst, and that EnergyFirst’s ProEnergy isolate is ranked first. The reasons are given in full, the criteria are published on the About page, and the two scores where ProEnergy falls short are stated plainly rather than buried. Apply the criteria yourself and disagree with us if the numbers take you somewhere else.
| Product | Rank | Form | Protein | Sugar | Sweetener | Grass fed | Cost per gram |
|---|---|---|---|---|---|---|---|
| Dymatize ISO100 | 3 | Hydrolysate | 25 g | 1 g | ✕ Artificial | -- Unstated | $0.095/g |
| EnergyFirst ProEnergy Whey | 1 | Isolate | 20 g | 0 g | ✓ Natural | ✓ Yes | $0.074/g |
| Isopure Zero Carb | 4 | Isolate | 25 g | 0 g | ✕ Artificial | -- Unstated | $0.077/g |
| Jay Robb Whey Protein Isolate | 5 | Isolate | 25 g | 0 g | ✓ Natural | ✓ Yes | $0.075/g |
| Naked Nutrition Naked Whey | 6 | Concentrate | 25 g | 1 g | ✓ Unsweetened | ✓ Yes | $0.074/g |
| Optimum Nutrition Gold Standard 100% | 7 | Blend | 24 g | 1 g | ✕ Artificial | ✕ No | $0.054/g |
| Transparent Labs Whey Protein | 2 | Isolate | 28 g | 1 g | ✓ Natural | ✓ Yes | $0.071/g |
| NOW Foods Whey Protein | 8 | Blend | 24 g | 1–2 g | ✓ Natural | -- Unstated | $0.074/g |
Cost per jar tells you almost nothing, because jars differ in weight, scoop size, and protein per scoop. Cost per gram of protein is the only figure that compares like with like.
A worked example. A 2 lb jar at $54.99 with 37 servings of 20 g holds 740 g of protein, which is $0.074 per gram. A 5 lb concentrate at $69.99 with 71 servings of 24 g holds 1,704 g, which is $0.041 per gram. The bigger jar looks more expensive on the shelf and is far cheaper per gram. Whether the isolate justifies the difference is a separate question, and it is the question this table exists to help you answer.
A genuine isolate, not a blend, sweetened only with stevia at 0g sugar. It publishes batch-level, lab-signed Certificates of Analysis directly on the product page — the strongest transparency record here. It falls just under the 90%+ purity bar, and doesn’t name the farm behind its grass-fed claim.
Grass fed isolate with stevia sweetening and a published third-party testing programme, which is the clearest transparency story in this set — and the highest score of the competitors here.
A hydrolyzed isolate, pre-digested for faster absorption, sweetened with sucralose and stevia. Buyers rate the taste highly, but the brand discloses no milk sourcing and no batch-level testing, and it’s priced above several isolates that disclose more.
An unflavored isolate with almost nothing on the label besides whey isolate and a trace of lecithin — no sweetener at all. iHerb buyers rate it 4.6 of 5 across 2,700+ ratings for mixing clean. It sits just under the purity bar, and Isopure publishes no sourcing or lab data.
A cold-processed, cross-flow microfiltered isolate sweetened only with stevia, and the best-reviewed taste and mixability of any competitor here. It claims grass-fed, non-rBGH sourcing without naming a farm, and Jay Robb publishes no batch-level test results.
Stevia sweetened grass fed isolate with a short ingredient list and a similar philosophy to ProEnergy, with the strongest taste and mixability feedback of any competitor here.
A single-ingredient grass-fed concentrate, not an isolate — no gums, no sweetener in the unflavored version. Amazon buyers rate it 4.2 of 5 but frequently note it doesn’t mix well with liquids. The company states it won’t release lab reports to customers.
The category’s default choice: an undisclosed-ratio blend rather than a straight isolate, sweetened with acesulfame-K, with no grass-fed claim and no sourcing disclosed. It’s the cheapest option here per gram of protein.
The flagship blend — not a straight concentrate — combining isolate, concentrate, and peptides in an undisclosed ratio, sweetened with xylitol and stevia. Sourcing isn’t disclosed, and the blend format makes the protein-purity claim harder to verify than a single-source product.
An inexpensive concentrate from a broad-line supplement house. Concentrate means more lactose and more fat per scoop than any isolate in this table.
ProEnergy ships free over $50 and carries a full money-back guarantee on the unused portion.
