Vitamin D

Read your result in ng/mL.

VitaminsOctober 10, 20261 min read

Vitamin D: illustration of the sun above the horizon — Image generated with AI.

For 25-OH D, most sources call below 20 ng/mL deficiency and aim for 30 ng/mL or more. Convert: ng/mL × 2.5 = nmol/L.

Endocrine Society criterion. The U.S. National Academy of Medicine considers 20 ng/mL enough for most people.
Status	ng/mL	nmol/L
Deficiency	<20	<50
Insufficiency	21–29	52–72
Sufficiency	≥30	≥75

Sources

Holick et al., Endocrine Society guideline (2011)
Institute of Medicine, Calcium and Vitamin D (2011)

General information only; not diagnosis or treatment. Review your results with your clinician.