VitaminDB Data Study · August 2026

The same nutrient, a median 8.3× price gap

Name: VitaminDB supplement price-spread dataset
Creator: VitaminDB
License: https://creativecommons.org/licenses/by/4.0/

We analyzed 2,786 supplement products and, for each nutrient, compared price per unit of active ingredient — the same milligram of magnesium, the same IU of vitamin D. Across 31 nutrients, the priciest products cost a median 8.3× — and up to 51× — more than the cheapest for the exact same dose.

8.3×

median price spread, same dose

nutrients analyzed

2,786

products in catalog

The key finding

Sticker price tells you almost nothing about value. Two bottles of the same nutrient can carry the same active dose at wildly different prices — or a cheaper bottle can quietly under-dose, so you take more capsules and pay more per actual milligram. Normalizing every product to cost per active unit is the only honest way to compare, and the gaps are large:

Vitamin D3priciest costs 34× the cheapest / IU
Magnesiumpriciest costs 19× the cheapest / mg
Zincpriciest costs 12× the cheapest / mg
Calciumpriciest costs 18× the cheapest / mg
Vitamin Cpriciest costs 51× the cheapest / mg

That spread is pure margin you can avoid. The whole point of VitaminDB is to surface the low-cost-per-dose end of each of these distributions automatically.

Price spread by nutrient

Nutrient	Products	Unit	Price spread, same dose
Vitamin C	24	/ mg	51×	cheapest
Vitamin D3	248	/ IU	34×	cheapest
Iron Bisglycinate	27	/ mg	23×	cheapest
Vitamin K2	33	/ IU	21×	cheapest
Magnesium	71	/ mg	19×	cheapest
Vitamin B6	68	/ mg	18×	cheapest
Calcium	29	/ mg	18×	cheapest
Vitamin B7	82	/ mcg	18×	cheapest
CoQ10	39	/ mg	16×	cheapest
Hyaluronic Acid	25	/ mg	13×	cheapest
Zinc	48	/ mg	12×	cheapest
Vitamin B2	41	/ mg	11×	cheapest
Vitamin B3	77	/ mg	10×	cheapest
Vitamin B9	52	/ mcg	9.3×	cheapest
Lecithin	22	/ mg	8.9×	cheapest
Electrolytes	22	/ serving	8.3×	cheapest
Valerian root	21	/ serving	8.3×	cheapest
Collagen Peptides	34	/ serving	8.1×	cheapest
Methylcobalamin	52	/ mcg	8.0×	cheapest
Tart cherry	24	/ serving	7.7×	cheapest
Vitamin B12	123	/ mcg	7.6×	cheapest
PEA (palmitoylethanolamide)	20	/ mg	6.5×	cheapest
Creatine Monohydrate	27	/ g	6.0×	cheapest
Vitamin B1	52	/ mg	5.8×	cheapest
Creatine Monohydrate	28	/ g	5.8×	cheapest
Boron	29	/ mg	5.5×	cheapest
Taurine	20	/ mg	5.2×	cheapest
L-tryptophan	29	/ mg	4.9×	cheapest
Vitamin B5	27	/ mg	3.7×	cheapest
Protein Powder	73	/ g	2.7×	cheapest
Whey Protein	38	/ g	2.2×	cheapest

Live from the curated Amazon US catalog, recomputed hourly. Updated August 2026.

How we calculated it

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.

Stop overpaying for the same molecule

VitaminDB ranks every supplement by real cost-per-dose so you land on the cheap end of these spreads automatically. Browse all nutrients, or jump to the cost-per-dose ranking for Vitamin D3, Magnesium, Zinc.

For journalists & researchers — free to cite

These findings are free to quote with a link back to this page. Key data points (as of August 2026):

For the same amount of active ingredient, the priciest supplements cost a median 8.3× — up to 51× — more than the cheapest. The widest gap is Vitamin C, where the priciest costs 51× the cheapest per mg.
Based on 2,786 tracked Amazon US products across 31 nutrients, each normalized to cost per active unit (per IU, per mg).
“Spread” is the 90th ÷ 10th percentile cost per unit, so one-off outliers and multipacks are excluded.

Suggested citation: VitaminDB, “Supplement Price-Spread Data Study” (August 2026). https://www.vitamindbc.com/research/supplement-price-spread

Download the data (CSV) — per-nutrient spread, percentiles, and sample size (CC-BY 4.0).

Questions, interviews, or a custom data cut (a specific nutrient, brand, or time window)? Email [email protected] — we’re happy to help reporters.

Frequently asked questions

What is the widest supplement price spread?

The widest gap is Vitamin C: the priciest products cost 51× the cheapest for the same amount of active ingredient (per mg). Across all 31 nutrients the maximum spread is 51×.

What is the typical (median) supplement price spread for the same dose?

Across 31 nutrients and 2,786 tracked products, the median spread is 8.3×: for the same amount of active ingredient, the priciest products typically cost 8.3× more than the cheapest.

How is the price-spread data collected?

Each product is normalized to cost per active unit = price ÷ (servings per container × dose per serving), compared only within a nutrient’s dominant dose unit. Spread is the 90th-percentile cost per unit ÷ the 10th-percentile cost per unit, which excludes one-off outliers and multipacks. Only nutrients with at least 20 comparable products are included; data is recomputed hourly from the live Amazon US catalog.