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Myprotein Impact Weight Gainer vs Nature Made Vitamin D3 1000 IU

The published reviews of Myprotein Impact Weight Gainer and Nature Made Vitamin D3 1000 IU, 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

Nature Made Vitamin D3 1000 IU scores 7.4/10 against Myprotein Impact Weight Gainer's 6.8. The widest gap is value against the generic equivalent: 5 for Myprotein Impact Weight Gainer, 8 for Nature Made Vitamin D3 1000 IU.

Pick Myprotein Impact Weight Gainer if…

  • you want a serving that matches the amount used in research

Pick Nature Made Vitamin D3 1000 IU if…

  • you want better value against the plain generic version
  • you want a product with a third-party certification
  • 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
Nature Made Vitamin D3 1000 IU7/10

Dose against the studied amount

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

Myprotein Impact Weight Gainer8/10Leads
Nature Made Vitamin D3 1000 IU6/10

Label transparency

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

Myprotein Impact Weight Gainer6/10
Nature Made Vitamin D3 1000 IU8/10Leads

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
Nature Made Vitamin D3 1000 IU8/10Leads

Safety and tolerability

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

Myprotein Impact Weight Gainer8/10
Nature Made Vitamin D3 1000 IU8/10

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
  • Nature Made Vitamin D3 1000 IUNot in the formula

Vitamin DEvidence A

NHS daily amount to adult upper limit: 10–100 mcg a day

  • Myprotein Impact Weight GainerNot in the formula
  • Nature Made Vitamin D3 1000 IU25 mcg (1000 IU) per softgelIn range

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.
  • Nature Made Vitamin D3 1000 IU$0.06 a serving · $19.29 for 300 servings at Nature Made, checked 23 Sept 2026

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

Nature Made Vitamin D3 1000 IU

  • 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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