30 Sep 2021 --- As the days draw shorter across the Northern Hemisphere and flu season beckons, attention is turning toward vitamin D, with supplement retailer Holland & Barrett recently celebrating the first day of fall as “Vit D Day.” However, the French Agency for Food, Environmental and Occupational Health & Safety (ANSES) is warning of the dangers of vitamin D overdose, especially for infants. As a result, it is urging the French public to opt for vitamin D medication rather than food supplementation.