Vitamin E is an antioxidant that's essential for eye health. A deficiency can lead to vision loss over time.

Symptoms of a vitamin C deficiency include weakness, bruising, and dry skin. Learn more about the warning signs and how to get more vitamin C in your diet.

Blood cell disorders impair the formation and function of red blood cells, white blood cells, or platelets. Learn more.

Relative Energy Deficiency in Sport (REDs) was first introduced in 2014 by the International Olympic Committee’s expert writing panel, identifying a syndrome of deleterious health and performance ...