Vitamin D in Australia
Australia has one of the world's highest melanoma rates and, in parallel, a surprisingly high vitamin D deficiency rate — roughly 30% of adults nationally, higher in Victoria and Tasmania in winter. The "slip-slop-slap" sun-safety campaigns successfully reduced sun exposure; supplementation and modest sensible exposure now fill the vitamin D gap.
Prevalence data
Australian Health Survey (2011-12) found 23% of adults deficient (25(OH)D < 50 nmol/L), rising to 42% in Victoria in winter. Rates markedly higher in women (particularly veiled), dark-skinned migrants (60–80%), and housebound elderly.
Latitude gradient
Darwin (12° S) — year-round strong UVB, deficiency mainly from behaviour. Sydney (34° S) — year-round with brief winter reduction. Melbourne (37° S) — meaningful winter reduction; supplementation useful. Hobart (43° S) — Australia's most vitamin D-limited city; winter deficiency common; supplementation strongly warranted.
Cancer Council balanced position
- UV Index ≥ 3 (most of Australia, most of the year): a few minutes of exposure to face + arms most days provides adequate vitamin D. Sun protection required for extended exposure.
- UV Index < 3 (winter in southern Australia, early morning/late afternoon most times): about 2–3 hours per week of outdoor exposure to face, arms, hands may be needed.
- Supplementation recommended for people at risk of deficiency or when sun exposure is difficult.
NHMRC recommended dietary intakes
- Ages 1–50: 5 µg/day (200 IU) — lower than US/Canada RDAs; reflects earlier consensus.
- Age 51–70: 10 µg/day (400 IU).
- Age 71+: 15 µg/day (600 IU).
- Note: many Australian clinicians now use higher targets, closer to US Endocrine Society levels.
Testing 25(OH)D in Australia
Medicare covers 25(OH)D testing under specific clinical indications (osteoporosis, malabsorption, hyperparathyroidism, chronic kidney disease, dark skin, veiled women, chronic drug use). Restrictions tightened 2014–2020 to reduce inappropriate testing. Private testing is available for $50–100 out of pocket.
Australian dosing practice
- Standard OTC 1,000 IU cholecalciferol widely available; often called "Ostelin" branded product.
- Prescription 25,000 or 50,000 IU capsules for correction of documented deficiency.
- Winter maintenance 1,000–2,000 IU/day for southern-Australia adults.
- Year-round supplementation for dark-skinned, veiled, or housebound Australians.
- Combine with sensible sun (a few minutes outdoor time when UV is ≥ 3), never with sunburn.