- Deficiencies in iron, vitamin A, zinc, folate, vitamin B12, vitamin D, and iodine may exist in 372 million children, and in 1.2 billion non-pregnant women of reproductive age - a pooled analysis of individual-level data from population-representative surveys https://www.thelancet.com/journals/langlo/article/PIIS2214-109X(22)00367-9/fulltext 6 comments science