Impact Whey vs Bulk Pure Whey
MyProtein Impact Whey vs Bulk Pure Whey Protein — the two UK value giants go head to head on protein, sugar and amino acids.
MyProtein
MyProtein Impact Whey
67g protein / 100g
Bulk
Bulk Pure Whey Protein
71g 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 — pick your trade-off
This is the tightest rivalry we've tested. Bulk edges protein density (71g vs 67g per 100g) and Clean Score (94 vs 90), while the amino profiles are essentially identical — leucine 7.10g vs 7.26g per 100g, a rounding error.
The real difference is sugar: 12g per 100g in the Bulk representative vs 5.3g in MyProtein's. That's the trade-off hiding behind the protein number — 4g more protein per 100g, but more than double the sugar.
Verdict: want max protein per scoop, take Bulk. Want the leaner macro profile, take MyProtein. On muscle-building potential alone, they're interchangeable.
Head to head
Per 30g scoop, from UK label data.
| MyProtein Impact Whey | Bulk Pure Whey Protein | |
|---|---|---|
| Protein | 20.1g | 21.3g ✓ |
| Calories | 112 ✓ | 113 |
| Sugar / 100g | 5.3g ✓ | 12.0g |
| Fat / 100g | 6.2g | 3.5g ✓ |
| Clean Score | 90 | 94 ✓ |
| Leucine | 2.20g ✓ | 2.10g |
| BCAAs | 4.60g | 4.70g ✓ |
| EAAs | 9.80g ✓ | 9.70g |
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
2.20g vs 2.10g
BCAAs
4.60g vs 4.70g
EAAs
9.80g vs 9.70g
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 | Bulk Pure Whey Protein |
|---|---|---|
| Histidine * | 1.22g | 1.15g |
| Isoleucine * | 4.20g | 4.44g |
| Leucine * | 7.26g | 7.10g |
| Lysine * | 6.21g | 6.48g |
| Methionine * | 1.47g | 1.51g |
| Phenylalanine * | 2.19g | 2.04g |
| Threonine * | 4.63g | 4.70g |
| Tryptophan * | 1.34g | 0.89g |
| Valine * | 3.98g | 4.17g |
| Glutamic acid | 11.70g | 12.42g |
| Aspartic acid | 7.24g | 7.72g |
| Proline | 3.89g | 3.82g |
| Alanine | 3.40g | 3.55g |
| Serine | 3.38g | 3.28g |
| Tyrosine | 2.02g | 1.77g |
| Arginine | 1.79g | 1.51g |
| Glycine | 1.26g | 0.89g |
| Cysteine | 1.56g | 1.51g |
* Essential amino acid. All values manufacturer-verified — never estimated.
Who should buy which
Buy Impact Whey if…
You want the lower-sugar option, the bigger flavour range, or you're already a MyProtein basket shopper. The cleaner everyday macro profile.
Buy Bulk Pure Whey if…
You want the most protein per scoop for the money and don't mind the extra sugar. Slightly better Clean Score too.
Frequently asked
Which is better, MyProtein or Bulk whey?
On our testing they're near-identical for muscle building: amino profiles match within a rounding error. Bulk gives slightly more protein per 100g (71g vs 67g); MyProtein has far less sugar (5.3g vs 12g).
Why does Bulk whey have more sugar?
Flavour systems differ by product — the Berries & Cream representative we tested carries 12g sugar per 100g vs 5.3g in the Impact Whey. Check your specific flavour's label; it varies across the range.
Which is cheaper?
Both compete aggressively on price with near-constant discount codes. Compare price per 100g of protein — not per tub — on the day you buy.
Compare them yourself, live
Run MyProtein Impact Whey against Bulk Pure Whey Protein in our interactive compare tool — with your own product picks.
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