Bananas are a healthy source of fiber, potassium, vitamin B6, vitamin C, and various antioxidants and phytonutrients. Specifically, bananas contain the following vitamins:

• Vitamin B6: Bananas are high in vitamin B6, with one medium-sized banana providing up to 33% of the Daily Value (DV) of this vitamin.
• Vitamin C: Like most fruit, bananas are a good source of vitamin C.

Bananas also contain other essential nutrients such as potassium, fiber, and magnesium. However, according to the USDA FoodData Central, bananas do not contain vitamin B-12.