Pick an age group, see the published Recommended Daily Allowance and Tolerable Upper Intake Level. A reference lookup, not a personal supplement plan.
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Health Canada / IOM Recommended Daily Allowance
600 IU(15 µg)
Tolerable Upper Intake Level: 4,000 IU/day (100 µg). Total intake from food, fortified foods and supplements combined should generally stay below this ceiling unless a clinician has explicitly prescribed more.
Informational only — not a prescription
UnityLife is a lifestyle publication, not a medical one. The number above is the published Health Canada / IOM reference for an entire population group. It is not a personal recommendation. Whether you actually need more, less, or a measured serum-25(OH)D blood test depends on your individual context (skin tone, latitude, season, body weight, medication, medical conditions) and that judgement belongs to your doctor or a registered Canadian dietitian.
1 µg vitamin D = 40 IU. Source: Health Canada — Vitamin D and Calcium: Updated Dietary Reference Intakes (based on IOM 2010). Do not add up multiple sources of vitamin D (multivitamin + standalone D + fortified milk) without speaking to a clinician.
Why a reference lookup, not a personalised dose?
Vitamin D is one of the few nutrients where individual need varies enormously — by skin tone, latitude (a Canadian winter sun gives almost no UVB synthesis from October to March), body weight, sunscreen use, time spent outdoors, and certain medications. There is no useful way for a webpage to tell you how much you specifically need.
What we can show you is the published Health Canada / IOM reference number for your age group. That’s the starting point your doctor or dietitian will use too — alongside a serum 25-hydroxyvitamin D blood test if individual context warrants one.
The Canadian-winter context
Above ~37° N latitude (essentially everywhere in Canada south of Whitehorse), the sun’s angle from October through March is too shallow to produce meaningful vitamin D in skin. That’s why Health Canada recommends a daily 400 IU vitamin D supplement specifically for adults over 50, and why supplemental D is more relevant in winter than in summer for most Canadians.
Who should not rely on a generic reference
People taking corticosteroids, anti-seizure medication, or weight-loss drugs (which can interfere with vitamin D metabolism)
People with chronic kidney disease or liver disease
People with malabsorption conditions (celiac, Crohn’s, gastric bypass)
People with osteoporosis or documented previous deficiency
Anyone considering > 1,000 IU/day from supplements long-term
In any of those cases, your doctor or a registered Canadian dietitian should be the one setting your daily target — ideally with a baseline 25(OH)D blood test.
This tool is for educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a licensed Canadian healthcare professional. Read our full disclaimer.