The UK and Australian guidelines state that evidence is lacking to
support routine supplementation of vitamin A and that excessive quantities of fat - soluble vitamins may cause harm.
Routine Supplementation of Lactobacillus rhamnosus GG and Risk of Necrotizing Enterocolitis in Very Low Birth Weight Infants — Andrea F Kane — The Journal of Pediatrics
Many people are low in vitamin D and
routine supplementation is increasingly common and helpful.