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Oestrogen-containing contraceptive pills increase vitamin D levels, study finds

BMJ 2016; 354 doi: https://doi.org/10.1136/bmj.i4345 (Published 08 August 2016) Cite this as: BMJ 2016;354:i4345
  1. Susan Mayor
  1. London

Taking oestrogen-containing oral contraceptives is associated with increased vitamin D levels, a large US follow-up study has shown.1

Previous small studies have found that taking oestrogen in hormone replacement therapy or oral contraception may be associated with increases in serum levels of 25 hydroxyvitamin D (25[OH]D), which is the widely accepted clinical biomarker of vitamin D status. But it has been unclear whether this was a causative effect or due to other lifestyle factors.

Researchers investigated the …

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