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Cited answers about real cost per unit and value across categories — drawn only from our catalog. Every answer links the OutletPicks pages it draws from.

Catalog data as of 2026-07-22

How to avoid overpaying

  • Compare cost per active unit— elemental mg, EPA+DHA, or IU — not per capsule or per bottle. Two labels can price the same “per pill” yet differ several-fold per active dose.
  • The cheapest form may be poorly absorbed — magnesium oxide is the classic example: cheap per milligram, but your body takes up relatively little. Weigh absorption, not sticker price alone.
  • A larger count isn’t automatically cheaper per dose — divide price by servings before you decide. Our rankings do this for you.

Or browse all nutrients, goals, or the price-spread study.

References & sources

  1. Dietary supplement fact sheets (all) — NIH Office of Dietary Supplements
  2. USP Verified product participants — U.S. Pharmacopeia
  3. NSF certified products — NSF

We link primary sources and paraphrase their findings — never copy their text, tables, or images. Cost-per-dose figures are our own first-party catalog data.