Impact Whey Isolate vs Dymatize ISO100
MyProtein Impact Whey Isolate vs Dymatize ISO100 — the isolate showdown. Two 100/A powders separated by almost nothing on the label.
MyProtein
MyProtein Impact Whey Isolate
82g protein / 100g
Dymatize
Dymatize ISO100
83g protein / 100g
Representative products shown — the top efficiency scorer in each line. Tap a card for the full product page.
Our verdict
Too close to call on the label
This is the tightest isolate matchup we've tested: both score 100/A, with Dymatize edging protein (83.3g vs 82g per 100g), leucine (8.92g vs 8.69g) and Clean Score (94 vs 92) — all by margins that vanish in a real scoop (25.0g vs 24.6g protein, 2.68g vs 2.61g leucine per 30g).
MyProtein's counters are real: less sugar (2g vs 3.3g per 100g), less fat (0.9g vs 3.3g), and typically a much lower price. Dymatize's is the hydrolysation — pre-broken protein that's faster absorbing and often gentler on sensitive stomachs, which is partly what the premium pays for.
Verdict: buy Dymatize if your digestion notices the difference or money is no object; buy MyProtein for everything else. On muscle-building potential, they're interchangeable.
Head to head
Per 30g scoop, from UK label data.
| MyProtein Impact Whey Isolate | Dymatize ISO100 | |
|---|---|---|
| Protein | 24.6g | 25.0g ✓ |
| Calories | 108 ✓ | 110 |
| Sugar / 100g | 2.0g ✓ | 3.3g |
| Fat / 100g | 0.9g ✓ | 3.3g |
| Clean Score | 92 | 94 ✓ |
| Leucine | 2.60g | 2.70g ✓ |
| BCAAs | 5.50g | 5.50g |
| EAAs | 11.70g | 11.80g ✓ |
Amino acids: why they matter
Both brands publish verified aminograms — so we can compare what's actually in the protein, not just how much of it there is. Per 30g scoop.
Leucine
2.60g vs 2.70g
BCAAs
5.50g vs 5.50g
EAAs
11.70g vs 11.80g
Leucine — the trigger
Leucine is the amino acid that signals muscles to start building, via the mTOR pathway. Research points to roughly 2–3g per meal as the intake associated with maximal muscle protein synthesis — check where each scoop lands against that line.
BCAAs — the workers
Leucine, isoleucine and valine are burned directly in muscle rather than the liver. Honest context: BCAAs alone don't build muscle — research shows complete protein beats BCAA supplements. Their value here is as a quality marker of the whey itself.
EAAs — the builders
The 9 essential amino acids are the raw material of muscle protein synthesis — your body can't make them. Greater EAA availability per serving is associated with a stronger synthesis response, which is why this underrated number matters.
Full aminogram — all amino acids (per 100g)
| Amino acid | MyProtein Impact Whey Isolate | Dymatize ISO100 |
|---|---|---|
| Histidine * | 1.30g | 1.47g |
| Isoleucine * | 5.14g | 4.74g |
| Leucine * | 8.69g | 8.92g |
| Lysine * | 8.04g | 7.83g |
| Methionine * | 1.81g | 1.89g |
| Phenylalanine * | 2.48g | 2.59g |
| Threonine * | 5.58g | 5.74g |
| Tryptophan * | 1.48g | 1.38g |
| Valine * | 4.53g | 4.82g |
| Glutamic acid | 14.49g | 14.69g |
| Aspartic acid | 8.87g | 8.68g |
| Proline | 5.03g | 4.78g |
| Alanine | 4.25g | 4.13g |
| Serine | 3.65g | 4.19g |
| Tyrosine | 2.32g | 2.40g |
| Arginine | 1.66g | 2.29g |
| Glycine | 1.33g | 1.51g |
| Cysteine | 1.80g | 1.74g |
* Essential amino acid. All values manufacturer-verified — never estimated.
Who should buy which
Buy Impact Whey Isolate if…
You want isolate macros at concentrate-adjacent prices. Lower sugar, lower fat, and the discount codes do the rest.
Buy Dymatize ISO100 if…
You want hydrolysed isolate — the fastest-absorbing, easiest-digesting whey format — and you're willing to pay for it. The connoisseur's isolate.
Frequently asked
Which has more protein, Impact Whey Isolate or ISO100?
Dymatize, barely: 83.3g vs 82g per 100g — about 25.0g vs 24.6g per 30g scoop. Not a difference you'd ever feel.
What does hydrolysed mean?
The protein is pre-broken into smaller peptides, so it absorbs faster and is often easier on digestion. It's also more expensive to produce — a big part of ISO100's price premium.
Is isolate worth it over normal whey?
Only for specific reasons: lactose sensitivity, or cutting hard where every gram of macros counts. For most people, a good concentrate delivers ~90% of the result for much less money.
Compare them yourself, live
Run MyProtein Impact Whey Isolate against Dymatize ISO100 in our interactive compare tool — with your own product picks.
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