Edmonton sits at latitude 53 degrees north. From October through April, the sun hangs so low that UVB rays are too weak for your skin to produce vitamin D. That is roughly seven months of the year where the sunlight that reaches you simply cannot do the job. Statistics Canada data shows that about 1 in 3 Canadians have vitamin D levels below what is considered optimal. In a northern city like Edmonton, the odds are even worse.
What vitamin D actually does
Vitamin D is not just about bones, although that is its best-known role. It helps your body absorb calcium and phosphorus, supports your immune system, regulates mood, and plays a part in muscle function. When your levels drop, the effects show up across your entire body, and many people chalk it up to the usual winter slump without realizing there is a fixable cause.
Symptoms to watch for
Vitamin D deficiency does not always announce itself clearly. The signs tend to build slowly and overlap with other conditions, which is part of why so many cases go unrecognized:
- Fatigue and low energy that persists even after a full night of sleep
- Bone or back pain, especially a general aching in the lower back, hips, or legs
- Getting sick often with colds, flu, or respiratory infections
- Low mood or seasonal depression that worsens through the darker months
- Muscle weakness, particularly difficulty with stairs or getting up from a chair
- Brain fog and difficulty concentrating
- Slow wound healing after cuts or minor surgery
If several of these sound familiar, especially between November and March, low vitamin D is worth investigating.
Who is at higher risk?
Everyone in Edmonton is at some risk during winter simply because of where we live. But certain groups face a higher chance of deficiency:
- Adults 65 and older produce less vitamin D through the skin and may spend more time indoors
- People with darker skin, as higher melanin levels reduce UVB absorption
- Indoor workers who get little midday sun exposure even during summer months
- People who cover most of their skin for cultural or personal reasons
- Those with certain conditions such as celiac disease, Crohn's disease, or kidney disease that affect vitamin D absorption or conversion
- People taking certain medications including some anti-seizure drugs and corticosteroids
How it is diagnosed
The standard test is a blood draw measuring 25-hydroxyvitamin D (also written as 25(OH)D). Your doctor orders it and Alberta Health covers the cost. Optimal levels are generally considered to be 75 to 150 nmol/L. Levels below 50 nmol/L indicate deficiency, and below 30 nmol/L is severe deficiency.
If you suspect low vitamin D, talk to your doctor about getting tested. The blood draw is quick and results typically come back within a few days. Knowing your actual level helps determine the right supplement dose rather than guessing.
Treatment: vitamin D3 supplements
For most adults, Health Canada and the Canadian Paediatric Society recommend 400 to 1,000 IU of vitamin D daily as a baseline. Many health professionals suggest 1,000 to 2,000 IU daily for adults living at northern latitudes like Edmonton, especially through the winter months.
If bloodwork reveals a significant deficiency, your doctor may recommend higher therapeutic doses, sometimes 5,000 to 10,000 IU per day for a set period to bring levels up, followed by a maintenance dose. Do not take high doses without medical guidance because vitamin D is fat-soluble and accumulates in the body.
D3 vs. D2: vitamin D3 (cholecalciferol) is more effective at raising blood levels than D2 (ergocalciferol). Most supplements and all the ones we recommend at Acme are D3.
Food sources: helpful but not enough
Some foods contain vitamin D, but it is difficult to get adequate amounts from diet alone:
- Fatty fish (salmon, mackerel, sardines): 400 to 600 IU per serving
- Fortified milk: about 100 IU per cup
- Egg yolks: roughly 40 IU each
- Fortified orange juice and cereals: varies by brand, typically 80 to 100 IU per serving
To put this in perspective, you would need to drink 10 to 20 cups of milk every day to reach 1,000 to 2,000 IU. A supplement is by far the most practical approach for Edmontonians.
How your pharmacist can help
You do not need a prescription to buy vitamin D supplements, but you do benefit from professional guidance. At Acme Drug Mart, your pharmacist can:
- Recommend the right dose based on your age, health conditions, current medications, and whether you have recent bloodwork
- Check for interactions with other medications you take, including blood thinners, heart medications, and certain diuretics
- Help you choose a quality product from the many options on shelves, because not all supplements are equal in absorption and purity
- Monitor your progress and suggest follow-up bloodwork timing with your doctor
- Deliver to your door with our free Edmonton-wide delivery, so you never miss a day
If you are taking calcium supplements alongside vitamin D, your pharmacist can advise on proper timing and dosing since the two work together for bone health but should be taken correctly.
Start now, not in October
Many Edmontonians wait until they are deep into winter and already feeling drained before thinking about vitamin D. If your levels are already low heading into fall, it takes weeks of consistent supplementation to bring them back up. Late August is a good time to start building a routine.
(780) 443-0202. Unit 103, 15508 87 Ave NW, Meadowlark Place, Edmonton. Walk in for a quick chat with your pharmacist about vitamin D, or call and we will deliver supplements right to your door.