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

Vitamin C (ascorbic acid) is a water-soluble vitamin important for immune support, heart health, iron absorption, and many bodily functions. A vitamin C deficiency can cause symptoms including fatigue ...

Being low on vitamin D can increase your risk of high blood pressure and diabetes, says Michael Holick, M.D., endocrinologist ...

This is a more unique symptom of riboflavin deficiency, leading to lesions at the corners of your mouth. “You may get scaling ...

Discover 7 fingernail changes that reveal dangerous protein deficiency. Your nails expose nutritional problems months before other symptoms appear in your body.

Vitamin D deficiency is fairly common and many people don't feel symptoms even if they're low on it. Your doctor can do a blood test to check your vitamin D level.

Do you have a vitamin D deficiency? An expert shares some symptoms to look out for If your levels are low, you may see warning signs — such as fatigue and bone pain — but not always.

“The majority of patients with [mild-to-moderate] vitamin D deficiency have no symptoms,” says Allyson Ocean, M.D., a gastrointestinal oncologist at Weill Cornell Medicine based in New York City.

Vitamin B12, a nutrient found mostly in animal products, is vital for healthy nerves and blood cells. A deficiency can go unnoticed because it can cause symptoms that are shared with other conditions.