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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.

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42%
of Americans are vitamin D deficient
CDC NHANES 2017-2020 (n=8,360)
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~50%
of Americans don't meet the RDA for magnesium
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20%
of premenopausal women are iron deficient
CDC NHANES 2017-2020
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65%
higher risk of magnesium deficiency for PPI users
Cheungpasitporn et al., 2015
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$63B+
US supplement market size (2026)
Grand View Research
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40-90%
of unsupplemented vegans are B12 deficient
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Vitamin D Blood Levels

According to CDC NHANES blood biomarker data from 8,360 US adults, 42% had serum 25(OH)D below 50 nmol/L, a cut-point used to define deficiency. Guidelines differ on cut-points. Adults ages 18-30 had the highest share below that line.

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

CDC NHANES data shows approximately 20% of premenopausal women had ferritin below 12 ng/mL.

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

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