Verified Supplement Data Primary-sourced

Cite Our Data

Evidence-based supplement statistics · Free to use with attribution

Everything on this page is free to cite, embed, and share — all we ask is a link back to verifiedsupplementdata.com. Our data comes from CDC NHANES blood biomarker analysis (n=8,360+), PubMed systematic reviews, and the NIH Dietary Supplement Label Database.

Shareable Statistics

Click any card to copy the embed code, download as an image, or grab the citation text.

22.1%
of US adults have vitamin D below 20 ng/mL (50 nmol/L)
CDC NHANES 2017-March 2020 (n=5,225)
Open Card →
~50%
of Americans don't meet the RDA for magnesium
Open Card →
~10%
of women ages 18 to 50 have ferritin below 12 ng/mL
CDC NHANES 2017-2020
Open Card →
43%
higher risk of low blood magnesium in PPI users (observational studies)
Open Card →
$63B+
US supplement market size (2026)
Grand View Research
Open Card →
40-90%
of vegans not taking B12 had low B12 status in one review
Open Card →

Citation Text Library

Pre-written paragraphs ready to paste into articles, show notes, or presentations. Each includes inline citations.

Vitamin D Blood Levels

In our analysis of CDC NHANES blood test data for 5,225 US adults, 22.1% had serum 25(OH)D below 50 nmol/L (20 ng/mL), a common cut-point for deficiency. Guidelines differ on cut-points. Adults ages 18 to 30 had the highest share below that line (32.6%).

Source: Verified Supplement Data analysis of CDC NHANES 2017-March 2020 Pre-Pandemic data. verifiedsupplementdata.com/deficiency-stats

Magnesium Supplementation

Rosanoff et al. (2012; PMID: 22364157) estimated that about half of Americans consume less magnesium from food than the recommended amount. Magnesium forms differ in reported bioavailability and tolerability (Firoz & Graber, 2001; PMID: 11794633).

Source: Verified Supplement Data. verifiedsupplementdata.com/magnesium/best-overall

Iron Stores in Women

In our analysis of CDC NHANES blood test data, about 10% of women ages 18 to 50 had ferritin below 12 ng/mL (9.5% at ages 18 to 30 and 10.5% at 31 to 50). Fewer than 1% of men in any age group did.

Source: Verified Supplement Data. verifiedsupplementdata.com/deficiency-stats

API Access

For programmatic access to our supplement data, use our JSON API:

API responses include structured product data.

Usage Terms

Free to use with attribution. You may cite, embed, screenshot, and share any data on this page and on verifiedsupplementdata.com. All we ask is a link back to the source page. For press inquiries or bulk data access, see our About page.