Essential vitamin for immune regulation, bone health, and mood.
How it works
Vitamin D activates innate and adaptive immune responses. Deficiency is linked to increased susceptibility to infection.
Evidence-based uses
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
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
4 products compared across Australian retailers. Sorted by price per serve.
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| Product | Price | /serve | |
|---|---|---|---|
Best NOW Foods Vitamin D-3 2000 IU, 240 Softgels iHerb | $16.32 | $0.07 | |
Life Extension Vitamin D3 5000 IU, 60 Softgels Life Extension | $14.99 | $0.25 | |
Thorne Thorne Vitamin D-5000 Thorne | $22.00 | $0.37 | |
Thorne Vitamin D-5000, 60 Capsules Thorne | $24.99 | $0.42 |
Prices in AUD. Some links are affiliate links — we may earn a commission at no extra cost to you.
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Also consider
Vitamin
Powerful antioxidant essential for collagen synthesis and immune function.
Mineral
Essential mineral involved in immune function, wound healing, and cell division.
Herb
Elderberry (Sambucus nigra) is a dark purple berry rich in anthocyanins and flavonoids that support immune function. Available in capsules, gummies, syrups, and liquid extracts, elderberry is one of Australia's most popular natural immune supplements. Clinical trials show elderberry may reduce the duration and severity of colds and flu by up to 4 days.
Amino Acid
Precursor to glutathione, the body's most powerful antioxidant. Supports liver detoxification, respiratory health, and mental health.
Get a personalised dosage recommendation based on your age, weight, and health goals
Vitamin D has 2 known interactions. Check if it's safe with your medications.
Evidence Lab
Despite abundant sunshine, 1 in 4 Australians are vitamin D deficient. Here's why, who's most at risk, and what dose actually works.
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Read articlePrice drops, new products, and research updates for vitamin d supplements. One email per week, unsubscribe anytime.
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.