RDA in IU/day

Age	RDA (IU/day)	Upper limit (IU/day)
Infants 6-12 months*	400	1500
Children 1-3 years old	600	2500
Children 4-8 years old	600	3000
People 9-70 years old	600	4000
People over 70 years old	800	4000
Females 14-50 years old, pregnant/lactating	600	4000