NHS (UK): (http://www.nhs.uk/Conditions/vitamins-minerals/Pages/Vitamin-D.aspx)
| Pregnant and breastfeeding women | 400 IU/day (10 micrograms) |
| Infants (6 months to five years) | 280-340 IU/day (7-8.5 micrograms) |
| People aged 65+ and those not exposed to much sunlight i.e. housebound | 400 IU/day (10 micrograms) |
NIH (US) : (http://ods.od.nih.gov/factsheets/VitaminD-QuickFacts/)
| Life Stage | Recommended Amount |
| Birth to 12 months | 400 IU/day |
| Children 1-13 years | 600 IU/day |
| Teens 14-18 years | 600 IU/day |
| Adults 19-70 years | 600 IU/day |
| Adults 71 + years | 800 IU/day |
| Pregnant and breastfeeding women | 600 IU/day |