Vitamin D deficiency in the Australian context in the general population is largely confined to winter months in southern states when the sun protection message is not a relevant public health message. When the Global UV index is in the moderate to extreme range, undertaking
sun protection measures such as regular sunscreen application is unlikely to increase osteoporosis risk (Farrerons et al. 2001; Marks 1999). A study by Matsouka et al. (Fig. 3) showed that while sunscreen use initially reduced vitamin D absorption, this effect was dissipated after 7 days (Matsuoka et al. 1987).
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