The precursor of vitamin D is formed on the skin under the influence of sunlight only from April onwards, says research professor Suvi Virtanen.
Some people also need a vitamin d supplement in the summer, says THL’s research professor Suvi Virtanen.
Raisa Mattila
19:00 | Updated 19:49
The story is part of the I argue series, where one expert shares his or her views on an interesting topic related to his or her field.
Research Professor Suvi Virtanen from the Department of Health and Welfare (THL):
“Although days lengthen, sunlight is not relevant for vitamin D intake until April. Only from April to September do the sun produce wavelengths of UV-B radiation that form a precursor to vitamin D on the skin.
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