Children: The recommended dosage for infants less than 6 months is 300 IU daily. For children over the age of one year the dosage recommendation is 400 IU. It is preferable for children to get their vitamin D from a multiple vitamin unless directed by a health care practitioner.
Pregnancy and Nursing: Recent recommendations from the Canadian Pediatric Society suggest that pregnant and lactating women get 2,000 IU of vitamin D3 daily.
Seniors: No special precautions are known.