What are normal vitamin D levels in Canada?
Quick answer:Â In Canada, vitamin D sufficiency is defined as serum 25(OH)D levels above 75 nmol/L (30 ng/mL). Deficiency is below 50 nmol/L. ImmunoCeutica's immunology team suggests optimal target range is 125 to <250 nmol/L. This is where research supports the strongest immune, bone, and overall health benefits.
Most Canadians are surprised to learn their vitamin D levels are lower than expected - especially after winter.
What do the numbers mean?
Vitamin D is measured as serum 25-hydroxyvitamin D (25(OH)D). Health Canada and the Endocrine Society use nmol/L (Canada) or ng/mL (US). To convert: multiply ng/mL by 2.5 to get nmol/L.
What is considered deficient?
Below 50 nmol/L = deficient. Between 50–75 nmol/L = insufficient. Above 75 nmol/L = sufficient for bone health. ImmunoCeutica defines optimal immune support as 125 to <250 nmol/L.
Why might Canadian guidelines differ from U.S. ones?
Canada uses nmol/L; the US uses ng/mL. The thresholds are equivalent - the units just look different. What matters is knowing your own number, since deficiency is largely symptom-free.
How do I find out my level?
The only way to know is to test. ImmunoCeutica offers an at-home dried blood spot test with lab-accurate results and a personalized report - no clinic visit required.
How long does it take to see results after starting vitamin D supplementation?
Once you know your level and begin supplementing, results don't happen overnight. How quickly your levels rise - and how your body responds - depends on your baseline, dose, and individual biology.Â
Reviewed by Bonnie A. Mallard, Ph.D., Immunologist, ImmunoCeutica Inc.Â
This article is for educational purposes and does not constitute medical advice.