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Vitamin D in winter: what the data say

2026-07-17 · last AI check 2026-07-19

Vitamin D is formed in the skin under the influence of sunlight. In months with low sunshine, its natural production falls, and getting it from food becomes more important.

This is a physiological fact, not a recommendation to take a particular product. The decision on any possible supplementation of vitamin D — especially for children, pregnant women and older people — is best discussed with a doctor or dietitian.

Health claims in this article

The sentences below are officially authorised EU health claims.

Vitamin D contributes to the maintenance of normal bones EU health claim

Commission Regulation (EU) No 432/2012 of 16 May 2012, Annex — list of permitted health claims · register entry: 150, 151, 158 · EFSA opinion: 2009;7(9):1227
Condition of use on a product: The product is at least a source of Vitamin D.

Vitamin D contributes to the normal function of the immune system EU health claim

Commission Regulation (EU) No 432/2012 of 16 May 2012, Annex — list of permitted health claims · register entry: 154, 159 · EFSA opinion: 2010;8(2):1468
Condition of use on a product: The product is at least a source of Vitamin D.

This material is for information and education. It does not replace advice from a doctor or dietitian. For health matters, consult a qualified medical professional.