Dymatize ISO100 vs Isopure Zero Carb

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Choose ISO100 for hydrolyzed-isolate absorption, Informed Sport certification, and the most creative flavour range in mainstream whey (Fruity Pebbles, Cocoa Pebbles, Dunkin’ Glazed Donut). Choose Isopure for true zero-carb tracking, an Unflavoured version that stirs into food, and Informed Choice certification. Both are 25g protein per serving and excellent isolates — the choice comes down to whether absorption speed or carb-spec matters more.

Best for flavours + absorption

Dymatize ISO100

25g protein per serving. 100% hydrolyzed whey isolate. Informed Sport certified. 13+ flavours including licensed cereal brands. Faster absorption than standard isolate.

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Best for zero-carb tracking

Isopure Zero Carb

25g protein per serving. 100% whey isolate. 0g carbs, 0g sugar, 100 calories. Informed Choice certified. Includes an Unflavoured version.

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At a glance

  • Both are 25g protein per serving from pure whey isolate
  • ISO100 is hydrolyzed (pre-digested); Isopure is standard isolate
  • Isopure has 0g carbs and 0g sugar; ISO100 has approximately 2g carbs
  • ISO100 carries Informed Sport certification; Isopure carries Informed Choice — both credible
  • ISO100 has the licensed cereal flavours; Isopure has the Unflavoured version

Head-to-Head

Dymatize ISO100Isopure Zero Carb
Protein per serving25g25g
Calories per serving120100
Carbs per serving2g0g
Sugar per serving1g0g
Protein typeHydrolyzed whey isolate100% whey isolate
CertificationInformed SportInformed Choice
Flavour count13+ (incl. licensed cereal collabs)8 + Unflavoured
HydrolyzedYesNo

Dymatize ISO100

The data: 25g protein per scoop, 120 calories, 2g carbs, 1g sugar. 100% hydrolyzed whey isolate — the protein is pre-digested using enzymes into smaller peptides for approximately 30 minutes faster absorption than standard isolate at peak. Informed Sport certified (every-batch testing). Flavours include Gourmet Chocolate, Cookies & Cream, Fruity Pebbles, Cocoa Pebbles, Cinnamon Cereal, and Dunkin’ Glazed Donut.

Who it’s for: Drug-tested athletes who need Informed Sport’s batch-testing rigour. Buyers who specifically want hydrolyzed isolate for fastest absorption. Anyone who wants the most creative flavour innovations in mainstream protein — the licensed cereal collabs are the brand’s actual differentiator.

The honest critique: Hydrolyzed isolate is water-thin by design — won’t give you a milkshake consistency on its own. Blend with frozen fruit if you want body. The licensed flavours that make ISO100 distinctive carry a premium price. A few reviewers report a mild sour smell on first opening Gourmet Chocolate; it dissipates after mixing.

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Isopure Zero Carb

The data: 25g protein per scoop, 100 calories, 0g carbs, 0g sugar. 100% whey protein isolate — not hydrolyzed. Informed Choice certified. Available in 8 flavours plus an Unflavoured version. Multiple tub sizes; larger sizes are more cost-efficient per serving.

Who it’s for: Strict macro trackers and keto dieters who need true zero-carb protein. Anyone who wants the Unflavoured version to stir into Greek yoghurt, oatmeal, or savoury food without adding sweetness. Buyers prioritising the cleanest possible macro spec.

The honest critique: The zero-carb formula has no thickeners — Isopure is water-thin by design. A milkshake consistency isn’t possible from this powder alone; stir into Greek yoghurt instead of trying to fix it in a shaker. The 8-flavour catalogue is narrower than ISO100’s 13+. Standard isolate (not hydrolyzed) means slightly slower absorption than ISO100 — practically irrelevant for most users.

Isopure Zero Carb on Amazon →

Which Should You Buy?

Choose Dymatize ISO100 if

  • You want the most creative flavour range in mainstream whey
  • Informed Sport certification is what your sport requires
  • You specifically want hydrolyzed isolate for faster absorption
  • Licensed cereal flavours appeal to you (Fruity Pebbles, Cocoa Pebbles, Cinnamon Cereal)
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Choose Isopure Zero Carb if

  • You’re strict keto and need true zero carbs
  • You want the Unflavoured version for cooking and food applications
  • Informed Choice certification is sufficient for your needs
  • You prioritise the cleanest macro spec over flavour variety
Check Isopure on Amazon →

FAQ

Is Dymatize ISO100 better than Isopure?

ISO100 is hydrolyzed for faster absorption and Informed Sport certified; Isopure is standard isolate with zero carbs and Informed Choice certified. For drug-tested athletes ISO100 is the marginally stricter pick. For zero-carb tracking Isopure is the cleaner spec. Both are excellent 25g-protein isolates — the choice depends on which dimension matters more.

Which has fewer carbs?

Isopure Zero Carb — 0g carbs and 0g sugar per serving, the lowest in mainstream whey. ISO100 has approximately 2g carbs. For strict keto tracking, Isopure is the better pick.

Does hydrolyzed whey actually absorb faster?

Yes — roughly 30 minutes faster at peak amino acid uptake. The practical effect on muscle gain for recreational athletes is minimal. For elite athletes training multiple times per day, the marginal advantage may be relevant. For most users the difference is not meaningful.

Which certification is stricter, Informed Sport or Informed Choice?

Both are LGC programmes. Informed Sport is the stricter version — designed for athletes in WADA-tested sports — while Informed Choice covers a broader baseline of banned substances. For most recreational athletes either certification is sufficient. See our safety testing guide for the full breakdown.

Last reviewed: by the protein.supply editorial team.