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Head to head · Protein Powder

Dymatize ISO100 Hydrolyzed Whey Protein Isolate vs Legion Whey+ Grass-Fed Whey Protein Isolate

Dymatize scores higher overall (8.7 vs 8.3 out of 10), mainly on efficacy, value and experience. Legion still leads on transparency.

Updated September 2026 from our full reviews · How we score

Higher score
Front of Dymatize ISO100 Hydrolyzed Gourmet Chocolate 20-serving tub
DymatizeISO100 Hydrolyzed Whey Protein Isolate
8.7
Excellent

An all-isolate whey with a hydrolyzed fraction: 25 g protein and about 2.7 g leucine per 120-calorie scoop, with Informed Choice testing.

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Front of Legion Whey+ Dutch Chocolate 30-serving bag
LegionWhey+ Grass-Fed Whey Protein Isolate
8.3
Good

A naturally sweetened whey isolate from Truly Grass Fed-certified Irish milk, with Labdoor certification and batch lab reports linked online.

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The short answer

Choose Dymatize if…

  • Lifters who want a low-carb, low-fat isolate
  • People with mild lactose sensitivity
  • Drug-tested athletes
  • Calorie-conscious dieters
  • You care most about efficacy, value, experience

Choose Legion if…

  • People avoiding artificial sweeteners and dyes
  • Shoppers who want verified grass-fed sourcing
  • Buyers who like checking lab reports
  • You care most about transparency

Side by side

ISO100 Hydrolyzed Whey Protein IsolateWhey+ Grass-Fed Whey Protein Isolate
Our score8.7 / 108.3 / 10
Efficacy (30%)9.08.4
Quality & Purity (25%)9.08.9
Value (20%)8.07.0
Experience (15%)8.98.0
Transparency (10%)8.59.2
FormPowderPowder
Serving1 scoop (32 g)71 servings per container1 scoop (26 g, Dutch Chocolate)30 servings per container
Testing & certifications
Informed Choice
NSF Contents CertifiedThird-party testedNon-GMO Project Verified
DietaryGluten-freeGluten-free, Non-GMO, Sugar-free
Key ingredients
  • Hydrolyzed whey protein isolate and whey protein isolate25 g protein
  • Leucine (naturally occurring)2,677 mg
  • BCAAs (naturally occurring)5.5 g
  • Sucralose and steviol glycosides (stevia)
  • Truly Grass Fed whey protein isolate21-23 g protein (varies by flavor)
  • Stevia leaf extract
Flavors8 (Gourmet Chocolate, Gourmet Vanilla, Fruity Pebbles…)8 (Dutch Chocolate, French Vanilla, Cinnamon Cereal…)
Creator video reviews55

Pros and cons

ISO100 Hydrolyzed Whey Protein Isolate

  • 25 g of protein and about 2.7 g of leucine per 120-calorie scoop, all from whey isolate
  • Informed Choice banned-substance mark on the label
  • Only 2 g of carbohydrate and 1 g of sugar in Gourmet Chocolate
  • Dymatize publishes a full amino acid profile for the flavor
  • buyers frequently praise fast, clump-free mixing
  • About $1.55 per serving for the 5 lb tub, pricier than whey blends
  • Contains soy lecithin and is sweetened with sucralose (plus stevia in the current formula)
  • Some buyers still report bloating despite the isolate base
  • Evidence for a real-world benefit from hydrolysis is thin, so part of the premium is marketing

Whey+ Grass-Fed Whey Protein Isolate

  • Whey isolate certified under the Truly Grass Fed program
  • NSF contents-certified (Dutch Chocolate and French Vanilla) and Labdoor-certified, with certificates of analysis linked online
  • No artificial sweeteners or dyes, and no added sugar
  • buyers often mention smooth mixing and easy digestion
  • 21 to 23 g of protein per scoop, a little below leading isolates
  • About $2.06 per serving, with a higher list price on the brand site
  • Stevia is noticeable to some reviewers
  • Not in the NSF Certified for Sport or Informed Choice programs, and the Amazon listing states it contains milk and soy

Our verdicts

ISO100 Hydrolyzed Whey Protein Isolate

ISO100 is one of the most complete whey isolates you can buy: 25 g of protein per scoop with a published amino acid profile, minimal carbs and fat, and banned-substance certification. You pay a premium over whey blends, and the hydrolyzed angle is more marketing than proven performance edge, but for a lean, well-tested isolate that mixes easily it is a safe pick.

Full review

Whey+ Grass-Fed Whey Protein Isolate

Legion Whey+ is one of the most credible naturally sweetened whey isolates, pairing certified grass-fed sourcing with public lab testing. You get slightly less protein per scoop than some rivals and pay a premium, but for buyers avoiding artificial sweeteners who want proof of what is in the bag, it is an easy recommendation.

Full review

What creators say

Questions people ask

Is Dymatize better than Legion?
In our scoring, Dymatize ISO100 Hydrolyzed Whey Protein Isolate rates higher overall (8.7 vs 8.3 out of 10). Dymatize leads on efficacy, value and experience; Legion leads on transparency. Scores weigh efficacy, quality, value, experience and transparency.
Are Dymatize and Legion third-party tested?
Dymatize carries Informed Choice; Legion carries NSF Contents Certified.
Who should choose Dymatize over Legion?
Our reviews suggest Dymatize is best for lifters who want a low-carb, low-fat isolate, people with mild lactose sensitivity and drug-tested athletes, while Legion is best for people avoiding artificial sweeteners and dyes, shoppers who want verified grass-fed sourcing and buyers who like checking lab reports.

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