Vitamin D Deficiency in Ireland — Why It Matters and What to Do
Why most people in Ireland need vitamin D supplementation and how much to take.
Ireland is at high risk
Ireland’s northern latitude means we don’t make vitamin D from sunlight in skin from October to March. Most adults benefit from supplementation through autumn and winter, and many year-round.
Symptoms of deficiency
- Fatigue, low mood, muscle weakness
- Bone pain, increased fracture risk
- Children: rickets (rare but serious)
Recommended supplementation
- Adults: 800–1000 IU per day (especially Oct–March)
- Pregnancy: at least 400 IU daily
- Babies: HSE recommends 5 µg (200 IU) per day from birth to 12 months
- Higher doses for confirmed deficiency, under medical supervision
When to test
Routine testing is not necessary for most people — supplement appropriately and you cover the issue. Test if you have unexplained fatigue, bone pain, falls, or specific risk factors (dark skin, housebound, malabsorption, certain medications).
Treatment of deficiency
For confirmed deficiency, a loading dose followed by maintenance. We can prescribe and monitor.
FAQs
Do I need a blood test?
Most people don’t — just supplement. Test if you have specific risk factors.
Can I take too much?
Yes — at very high prolonged doses (typically over 4000 IU/day long-term without monitoring).
Should my child take vitamin D?
Yes — HSE recommends 5 µg/day from birth to 12 months.
Is sun exposure enough?
Not in Ireland from Oct–March. Even in summer, balance UV risk and benefit.
Cost of consultation?
€34.99.
Speak to an Online Doctor
Same-day video and phone consultations across Ireland, €34.99.