Make the facts comparable.
Keep the limits visible.
Published listings have a linked label source and editor review date. These are label claims, not independent laboratory verification. Merchant quotes may change; purchasing is not connected.
Start with the right serving.
We keep the original serving definition next to every amount. Package quantity and merchant price are separate from the formulation. When a real product changes its formula, its previous label version must remain traceable.
Compare only like with like.
Fish oil uses disclosed EPA plus DHA per serving, not total fish oil. Creatine uses declared grams per serving. Whey protein powder uses label-declared protein and powder grams per serving; plant proteins and mass gainers are excluded. Different groups cannot be mixed.
Show the unit-cost calculation.
Cost per serving is package price divided by servings per package. Fish oil cost is cost per serving × 1,000 ÷ EPA+DHA in mg. Creatine cost is cost per serving × 5 ÷ creatine in g. Whey cost is cost per serving × 25 ÷ protein in g. Whey protein percentage is protein grams ÷ powder grams × 100. These are arithmetic comparisons, not efficacy ratings; unavailable prices cannot produce unit costs.
Distinguish evidence from claims.
A label claim, a third-party certification and a batch-specific laboratory test are different evidence. A published listing has a label URL, review date and revision history, but this does not mean its contents were independently measured or certified.