Vitamin D
Essential vitamin for immune regulation, bone health, and mood.
How it works
Mechanism of Action
Vitamin D activates innate and adaptive immune responses. Deficiency is linked to increased susceptibility to infection.
Evidence-based uses
What Vitamin D Is Used For
Most Australians are deficient in winter. Get levels tested. Maintain 75-100 nmol/L.
Clinical Evidence
Daily or weekly vitamin D supplementation reduced the risk of acute respiratory infection by 12%, with greater benefit in those with deficiency.
Vitamin D supplementation reduced the risk of acute respiratory infection by 12% overall, with the greatest benefit (70% reduction) in those with severe deficiency at baseline.
Safety
Interactions & Warnings
Very high doses of vitamin D may reduce the effectiveness of some statins. Standard doses are generally safe.
Vitamin D combined with thiazide diuretics may cause elevated calcium levels (hypercalcemia). Monitor calcium levels.
Compare prices
Buy Vitamin D in Australia
8 products compared across Australian retailers. Sorted by price per serve.
| Product | Price | /serve | |
|---|---|---|---|
Best NOW Foods Vitamin D-3 2000 IU, 240 Softgels iHerb | $12.99 | $0.05 | Buy |
Blackmores Vitamin D3 1000IU 200 Capsules Chemist Warehouse | $14.99 | $0.07 | Buy |
Ostelin Ostelin Vitamin D3 1000IU Chemist Warehouse | $19.99 | $0.08 | Buy |
BioBalance Vitamin D3 1000 IU 90 Capsules HealthPost | $14.95 | $0.17 | Buy |
Ethical Nutrients Ethical Nutrients Vitamin D3 Mr Vitamins | $14.95 | $0.17 | Buy |
Life Extension Vitamin D3 5000 IU, 60 Softgels Life Extension | $14.99 | $0.25 | Buy |
Thorne Thorne Vitamin D-5000 Thorne | $22.00 | $0.37 | Buy |
Thorne Vitamin D-5000, 60 Capsules Thorne | $24.99 | $0.42 | Buy |
Prices in AUD. Some links are affiliate links — we may earn a commission at no extra cost to you.
Should you take Vitamin D?
Get a personalised supplement stack based on your health goals, age, medications, and preferences.
This information is for educational purposes only and is not intended as medical advice. Always consult a healthcare professional before starting any supplement. Evidence ratings are based on peer-reviewed clinical research. Individual results may vary.