vitamin D

good for: immune health, bone growth, inflammation

found in: sunshine, seafood, fortified dairy

Vitamin D earns a solid A+ when it comes to leveling up immunity. Our immune cells each have a built-in vitamin D receptor, which means that our immune system pretty much runs on the stuff. It just might be the most important of all the vitamins, especially if you plan on not getting sick any time soon. Sure, you can get Vitamin D from the sun - but millions of us are still deficient. We put 45% DV of Vitamin D in happy being® healthy, so you can sip your sunshine (and lower the risk of chronic disease).