The same nutrient, a median 292× price gap

Cost per active unit = price ÷ (servings per container × dose per serving). For each nutrient we compare products only within its dominant dose unit — IU of vitamin D against IU of vitamin D, mg of magnesium against mg of magnesium — so we never compare unlike doses.

Spread = the 90th-percentile cost per unit ÷ the 10th-percentile cost per unit. Using the 10th/90th percentiles (not the absolute min/max) deliberately excludes one-off outliers, multipacks, and mis-labeled listings, so the figure reflects the realistic top-to-bottom of the market rather than a freak data point.

Only nutrients with at least 20 comparable products are included. Prices and serving counts come from product labels in our live catalog. Combination products can add noise; the percentile band is chosen to limit it. This is a value comparison, not medical or dosing advice — it does not say how much of any nutrient you should take.