Vitamin D (25-OH) result checker
Enter your 25-hydroxyvitamin D result to see where it falls against Osteoporosis Canada reference ranges — from severe deficiency to optimal — with general supplement dosing and why South Asians in Canada are at especially high risk.
— nmol/L
Medical disclaimer: This calculator is for general educational purposes only and does not constitute medical advice or a diagnosis. Results are estimates based on the values you enter and standard formulas and reference ranges, which vary between laboratories and between individuals. Always discuss your results with a qualified healthcare professional. If you are experiencing a medical emergency, call 9-1-1.
Reference bands follow Osteoporosis Canada: under 30 nmol/L severe deficiency, 30–50 deficiency, 50–75 insufficiency, 75–125 optimal, and above 125 potentially excessive. Dosing here is general guidance — always confirm the right dose with your GP.
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Frequently asked questions
What is an optimal Vitamin D level in Canada?
Using Osteoporosis Canada ranges, 75–125 nmol/L is optimal, 50–75 is insufficiency, 30–50 is deficiency, under 30 is severe deficiency, and above 125 is potentially excessive. Units differ between countries — Canada uses nmol/L, the US uses ng/mL.
How much Vitamin D should I take?
General guidance is roughly 4000 IU/day when deficient (under 50 nmol/L) and about 2000 IU/day for insufficiency (50–75), with a lower maintenance dose once optimal. Always confirm the dose and duration with your GP, especially with kidney disease or high calcium.
Why are South Asians in Canada at higher risk?
Darker skin makes less Vitamin D from sunlight, and Canadian winters provide almost no UV-B, so deficiency is very common in South Asian Canadians. Low Vitamin D affects thyroid hormone conversion, insulin sensitivity, bone density and immunity.