Eggs are a solid source of vitamin D, but many foods like cod liver oil, rainbow trout, and fortified milk contain higher levels of this important nutrient.

Taking too much vitamin D can cause serious side effects. Learn the signs, why you might feel weird after taking it, and when to talk to your healthcare provider.

Medically reviewed by Patricia Mikula, PharmD Key Takeaways Most adults can safely take vitamin D supplements every ...

Low levels of vitamin D seem to raise your risk of heart attack but scientists are still figuring out why—and whether ...

Learn the best time to take vitamin K2, why it absorbs better with fat, and how it supports bone and heart health when paired with vitamin D.

Winter can feel like a natural time to slow down, but when profound fatigue, bone pain, and persistent low mood set in, it ...

Experiencing tiredness, feeling moody or noticing that your nails keep cracking easily. Here is what these signs mean and how ...

This winter, medical experts guide you through the latest diagnostic standards, the non-deficiency causes of fatigue, and the practical steps you can take ...