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Myprotein Impact Weight Gainer vs Optimum Nutrition Gold Standard 100% Plant Protein

The published reviews of Myprotein Impact Weight Gainer and Optimum Nutrition Gold Standard 100% Plant Protein, lined up: the five scores, what one serving delivers against the studied dose, the real cost per serving and what each label leaves out. Figures as of 28 September 2026.

The short answer

Optimum Nutrition Gold Standard 100% Plant Protein scores 7.6/10 against Myprotein Impact Weight Gainer's 6.8. The widest gap is evidence for the marketed claim: 7 for Myprotein Impact Weight Gainer, 8 for Optimum Nutrition Gold Standard 100% Plant Protein.

Pick Myprotein Impact Weight Gainer if…

It does not lead on any criterion we score. Read its review for the case in its favour.

Pick Optimum Nutrition Gold Standard 100% Plant Protein if…

  • you want a product with a third-party certification
  • you want the stronger evidence behind what it is sold to do
  • you want every amount on the label disclosed

Criterion by criterion

The five criteria every review is scored on, published on the grading page. The overall score is their average.

Evidence for the marketed claim

How strong the research is for what the product is actually sold to do — not for the ingredient in general.

Myprotein Impact Weight Gainer7/10
Optimum Nutrition Gold Standard 100% Plant Protein8/10Leads

Dose against the studied amount

Whether one serving delivers the amount used in the research behind the claim.

Myprotein Impact Weight Gainer8/10
Optimum Nutrition Gold Standard 100% Plant Protein8/10

Label transparency

Whether the Supplement Facts panel is published in readable text and every active amount is disclosed.

Myprotein Impact Weight Gainer6/10
Optimum Nutrition Gold Standard 100% Plant Protein7/10Leads

Value against the generic equivalent

Cost per gram or per dose of the active ingredient, compared with the plainest version of the same thing.

Myprotein Impact Weight Gainer5/10
Optimum Nutrition Gold Standard 100% Plant Protein6/10Leads

Safety and tolerability

Known risks and interactions, how well characterised they are, and whether the label warns about them.

Myprotein Impact Weight Gainer8/10
Optimum Nutrition Gold Standard 100% Plant Protein9/10Leads

Dose against the studied amount

What one labelled serving delivers, placed against the range on each ingredient’s evidence page. Where a label gives no figure, there is nothing to place, and that is the finding.

Whey protein blendEvidence A

Where muscle protein synthesis maxes out: 20–25 g a dose

  • Myprotein Impact Weight GainerAbout 31 g of protein per 100 g serving
  • Optimum Nutrition Gold Standard 100% Plant ProteinNot in the formula

What it actually costs

Price divided by labelled servings, from a dated listing. A serving is whatever the label calls one, which is why the studied-dose row matters more than the headline figure.

  • Myprotein Impact Weight GainerAbout £28.29–£37.99 for 2.5 kg at UK retailers in listings read on 28 September 2026 — roughly £1.13–£1.52 a serving. No per-serving figure: servings not recorded.
  • Optimum Nutrition Gold Standard 100% Plant ProteinAbout £21.95–£28.00 for the 684 g tub at UK retailers in listings read on 28 September 2026. No per-serving figure: servings not recorded.

Label checks

What each label discloses, and what it leaves out. Read from the reviews, not from the marketing.

Myprotein Impact Weight Gainer

  • Every active ingredient has a stated amount
  • No third-party certification

Optimum Nutrition Gold Standard 100% Plant Protein

  • Every active ingredient has a stated amount
  • Carries a third-party certification

How this comparison is built

  • Scores are the ones already published in each review. Nothing is re-scored for the comparison, and a product leads a criterion only when it outscores the rest.
  • Doses are read from the label rows in each review and placed against the studied range on the matching ingredient page. A figure that is not printed is never estimated.
  • Costs use a dated retailer price divided by labelled servings. Prices in different currencies are never ranked against each other.
  • Only products in the same category, or ones a review names as an alternative, can be compared. Commission never changes what appears here.

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