Over half of parents are not getting the essential vitamins they need because their parents are not giving them supplements, according to experts.
Children should have daily Vitamin D supplements, according to NHS guidelines, but 59% of parents admitted they did not give them to their kids.
In a wide-ranging survey from the Health Food Manufacturers' Association (HFMA), 64% of parents said they were satisfied with the amount of Vitamin D their child got from their diet.
The poll, which saw 10,000 UK adults questioned, including 5,800 parents, found that 76% of people didn't know that youngsters are advised to take Vitamin D supplements.
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In December 2012, gunman Adam Lanza shot dead 20 children and six teachers in the Connecticut school, before turning the gun on himself.
The study, conducted by the European Banking Authority, looked at how much capital would be used up in adverse economic conditions.