WheyProteinPowder.org is published by EnergyFirst and earns revenue from purchases made at energyfirst.com.

WheyProteinPowder.org is published by EnergyFirstand earns revenue from purchases made at energyfirst.com.
Whey protein isolate / 2026

Most whey protein is sold on the front of the jar. We read the back.

Trustpilot logoTrustpilot
Great rating
TrustScore 4.2
7 reviews
Protein as a percentage of scoop weight. Sugar grams. Sweetener type. Filtration method. What the cow ate. Then the only number that matters at checkout: cost per gram of protein.
Methodology

Six criteria, equally weighted

Each criterion scores from 0 to 10 and the six average to one decimal place. Nothing is weighted more heavily than anything else, which means a product cannot buy its way out of a bad ingredient list with a low price.

01

Protein purity

Protein as a percentage of scoop weight, and whether the form is isolate, concentrate, or a blend.

16.7%
02

Ingredient quality

Sourcing of the milk, filtration method, and how many ingredients exist purely to bulk the powder out.
16.7%
03

Sweetener profile

What supplies the sweetness, and how many grams of sugar and sugar alcohol come with it.
16.7%
04

Transparency

Panel clarity, published third-party testing, and how much the brand says about where the milk comes from.

16.7%
05

Taste and mixability

Drawn from aggregated buyer feedback across review platforms, not from our own palate.
16.7%
06

Value per gram

Cost per gram of protein at the best generally available price. Not cost per jar.

16.7%

We do not score on packaging, brand heritage, or how well a product markets itself. Full method on the About page.

Ranked

What we would actually buy

Three panels, in rank order. Where a figure has not been confirmed at source, the cell is left blank rather than filled with an estimate.

ProEnergy Whey Protein Isolate

EnergyFirst
Figures
verified
verified
Rank
#1
Protein form
Isolate
Protein per serving
20 g
Sugar per serving
0 g
Sweetener type
Natural
Grass fed
Yes
Cost per gram of protein
$0.074/g
Overall score
9.2 /10
9.2 /10
Cost per gram calculated at the case price of $54.99 for 37 servings of 20 g. Figures taken from the vanilla panel at energyfirst.com.

Whey Protein Isolate

Transparent Labs
verified
Figures
verified
Figures
Rank
#2
Protein form
Isolate
Protein per serving
28 g
Sugar per serving
1 g
Sweetener type
Natural
Grass fed
Yes
Cost per gram of protein
$0.071/g
Overall score
8.3 /10
8.3 /10

ISO100

Dymatize
Figures
verified
verified
Rank
#3
Protein form
Hydrolyzed Whey Isolate
Protein per serving
25 g
Sugar per serving
1 g
Sweetener type
Artificial
Grass fed
No
Cost per gram of protein
$0.068/g
Overall score
8 /10
8 /10
Fundamentals

Isolate, concentrate, hydrolysate. The difference costs you money.

Concentrate

29% to 89% protein by weight

The cheapest form and the most common. Filtration stops early, so lactose, fat, and moisture stay in the powder. Most retail concentrates land near 70 to 80%, which means a fifth to a third of every scoop is not protein.

Isolate

90%+ protein by weight

Filtered further until almost everything that is not protein has been removed, which takes the lactose and the fat with it. It costs more per jar and mixes thinner in water. If you tolerate lactose poorly, this is the form that solves it.

Hydrolysate

Pre-digested, typically 90%+

Isolate broken into shorter peptide chains before it reaches you, which speeds absorption. The breakdown also exposes bitter compounds, so hydrolysates usually need heavier flavouring. You pay a premium for a difference most people cannot detect.

Sourced

12,000+ ratings, three platforms

Aggregate scores for EnergyFirst as published by each platform. They do not agree with each other, and the gap between them is more informative than any single figure.

4.8 /5
9,527+ ratings

Collected by invitation after purchase, so the sample skews toward completed orders.

3.9 /5
2,067 ratings

A comparable sample size to Shopper Approved with a rating almost a full point lower.

4.0 /5
7 ratings

Seven reviews. Too small a sample to read anything into, and we are not going to pretend otherwise.

Great

Trustpilot rating
Rated 4.2 out of 5 based on 7 reviews
Trustpilot Trustpilot
Rating 5 stars
By Debbie Copple Montgomery

about 5 months ago

Best protein we've bought for years.

Best protein we've bought for years.

Rating 5 stars
By Fran

about 2 years ago

My favorite products are the ProEnergy Whey Protein and Green Energy Superfood Blend…

My favorite products are the Energy First ProEnergy Whey Protein in Vanilla and the Green Energy Super food Blend, both are added to my morning smoothie and I really have more energy throughout the day.

Rating 5 stars
By Faze Brady

about 2 years ago

I have utilized this product for over…

I have utilized this product for over ten years, as my weight has escalated due to eating habits and lack of exercising. It has always provided me with satisfactory results.

Rating 5 stars
By Bradford Fisher

about 57 years ago

Came quickly

Came quickly

Rating 5 stars
By chuck keathley

about 57 years ago

Excellent products delivered as…

Excellent products delivered as promised.

Rating 5 stars
By NATALIE

about 57 years ago

Energyfirst has kept me satisfied with…

Energyfirst has kept me satisfied with my order for over 5 years!! Never had an issue!!

Sourced

UNLOCK YOUR BODY'S POTENTIAL WITH

100% All Natural, Pharmaceutical Grade
Healthy Nutrition for Vibrant Health & Energy

Whey Protein Powder

All Natural Whey Protein Isolate from grass pasture fed cows NOT treated with hormones or antibiotics. Naturally sweetened with Stevia – the taste is awesome!

Green Drink

Powerful green superfood powder with alkalizing phytonutrients, enzymes and probiotics that boost immunity, increase focus and make you healthy. Try Greenergy® today!

Pre-Workout Drink

Charges up your workouts, your workday, and your life with long-lasting energy and mental clarity. Increase physical and mental performance with PreFuel.
Read next
Buyer's guide
Form, sugar, sweetener, fat, gluten, and how much protein you actually need.
Use case
What the satiety research shows, and the meal replacement maths behind it.
Recipes
Macros computed from the ingredients, grouped by when you would drink them.
FAQ
Lactose, timing, stevia, storage, denaturing, and baking with whey.

Ready to try the isolate we ranked first?

ProEnergy ships free over $50 and carries a full money-back guarantee on the unused portion. Case pricing brings it to $1.49 per 20 g serving.