Four Times the Recommended Vitamin D Dose Needed for Winter

"Maintaining adequate levels of vitamin D during winter months requires a daily dose four times the current recommended dose, according to a new study.

The study has important implications for ongoing consultations on vitamin D recommendations. The current level of five micrograms (200 International Units) is seen by many as insufficient.

While your body does manufacture vitamin D in response to sunlight exposure, the levels of sun in some northern countries are so weak during the winter months that your body makes no vitamin D at all."