Are you experiencing unexpected fatigue, tingling fingers or hair loss? While this could be the result of a variety of health conditions, it could also signal a vitamin deficiency. — 45% for ...

Vitamin B12 is a water-soluble vitamin typically found in animal products. In the U.S., about 6% of U.S. adults younger than 60 have a vitamin B12 deficiency, but that rate jumps to about 20% for ...

Vitamin B1, or thiamin, is essential for glucose metabolism and healthy nerve, muscle, and heart function. A deficiency of vitamin B1 can be fatal.