Commonly recommended daily intake of vitamin D is not sufficient if sunlight exposure is limited.
Glerup H; Mikkelsen K; Poulsen L; Hass E; Overbeck S; Thomsen J; Charles P; Eriksen EF; Journal Of Internal Medicine, 2000, vol. 247, issue 2, p 260, ISSN 09546820. ISBN 09546820.

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