Fact Check: do the niqab and burqa prevent intake of vitamin D from sunlight?

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UKIP would like to ban the burqa and niqab being worn in public because it says they “are barriers to integration”. However, UKIP is also concerned about the health of women who wear these garments as – according to its manifesto – they prevent the “intake of essential vitamin D from sunlight”. As part of The Conversation’s Fact Check series, we asked two academics to check the science behind the claim.