Discover how vitamin D plays a crucial role in maintaining strong and healthy bones.
If you've ever been told to "get more sun" for your bones, there's real science behind that advice. Vitamin D is one of the most essential nutrients for bone health — and most Canadians aren't getting enough of it, especially through the long winter months.
Here's what you need to know.
What Does Vitamin D Actually Do for Your Bones?
Vitamin D's most critical job is helping your body absorb calcium. Without enough vitamin D, your body can only absorb 10–15% of the calcium you consume from food. With adequate vitamin D, that number jumps to 30–40%.
Think of vitamin D as the gatekeeper — calcium is the building material, but vitamin D is what lets it through the door and into your bones.
When vitamin D levels are chronically low, your body starts pulling calcium from your bones to maintain normal blood calcium levels. Over time, this leads to:
- Decreased bone density
- Increased fracture risk
- In severe cases, osteomalacia (softening of the bones) or osteoporosis
Why Canadians Are at Higher Risk of Deficiency
Canada's northern latitude means that for roughly 4–5 months of the year, the sun's angle is too low to trigger vitamin D production in the skin — even on sunny days. This affects everyone, but is especially significant for:
- Adults over 50, whose skin produces vitamin D less efficiently
- People with darker skin tones
- Those who spend most of their time indoors
- Individuals with conditions affecting fat absorption (since vitamin D is fat-soluble)
- People living with osteogenesis imperfecta (OI) or osteoporosis, who already have compromised bone density
Health Canada recommends 600–800 IU of vitamin D daily for adults, but many bone health experts suggest that people with osteoporosis or OI may benefit from higher levels under medical supervision.
Vitamin D and Vitamin K2: A Powerful Pairing
Here's something most people don't know: vitamin D alone isn't the full picture. Vitamin K2 works alongside vitamin D to direct calcium into bones rather than soft tissues like arteries.
Without K2, the calcium that vitamin D helps absorb can end up in the wrong places — a process linked to arterial calcification. Together, D3 and K2 ensure calcium goes where it's needed most: your bones.
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Signs You Might Be Low in Vitamin D
Vitamin D deficiency is often called the "silent deficiency" because symptoms are subtle. Watch for:
- Fatigue or low energy that doesn't improve with rest
- Bone or muscle aches, especially in the back and legs
- Getting sick frequently (vitamin D supports immune function too)
- Mood changes or low mood, particularly in winter
- Slow healing from fractures or injuries
The only way to confirm a deficiency is a blood test — ask your doctor for a 25-hydroxyvitamin D test if you're concerned.
How to Maintain Healthy Vitamin D Levels
1. Safe sun exposure Aim for 10–30 minutes of midday sun on your arms and legs during spring and summer. Avoid burning, and note that sunscreen blocks vitamin D synthesis.
2. Food sources Vitamin D is found in fatty fish (salmon, mackerel), egg yolks, and fortified foods like milk and orange juice — though food alone rarely provides enough.
3. Supplementation For most Canadians, especially during fall and winter, supplementation is the most reliable way to maintain optimal levels. Look for vitamin D3 (cholecalciferol) rather than D2, as D3 is more effectively absorbed and retained by the body.
4. Pair it with the right nutrients Combining D3 with K2, calcium, and magnesium gives your bones the full support system they need.
The Bottom Line
Vitamin D is non-negotiable for bone health — especially if you live in Canada, are over 50, or are managing a condition like osteoporosis or OI. It's not just about preventing deficiency; it's about actively supporting the bones you have and protecting them for the years ahead.
If you're looking for a convenient, comprehensive option, ourÂ
Strong bones start with the right nutrients. Give yours what they need.