You’ll see vitamin D listed as international units (IU) and micrograms (mcg). The recommended dietary allowance, or RDA, for vitamin D is 600 IU or 15 mcg for children and young adults. After age 70, ...
Learn more We consulted with Victoria Burgess, Ph.D., CSCS, CISSN, a certified sports nutritionist ... and during pregnancy and postpartum. Our Ritual vitamin review includes eight of their popular ...