If you need to supplement,
choose one that contains D3(Cholecalciferol), since it's better at raising your blood
levels of vitamin D.
While some foods- like fortified dairy, egg yolk, beef liver, and fatty fish like salmon and canned tuna- can help you get vitamin D2, or ergocalciferol, direct sun exposure can
help you get your fix of vitamin D3, or Cholecalciferol.