A medium banana contains meaningful amounts of several vitamins, with vitamin B6 leading the pack at 25% of your daily value in a single fruit. It also provides vitamin C, folate, riboflavin, and niacin, making it one of the more vitamin-diverse fruits you can grab on the go.
Vitamin B6: The Standout
Vitamin B6 is the star of the banana’s nutritional profile. One medium banana delivers about 0.4 mg, which covers a quarter of the 1.7 mg daily value set by the FDA. That’s a surprisingly high concentration for a single piece of fruit, and it makes bananas one of the easiest whole-food sources of this vitamin.
Vitamin B6 is involved in more than 100 enzyme reactions in your body, most of them related to how you process protein. It helps your body break down amino acids, build hemoglobin (the molecule in red blood cells that carries oxygen), and regulate blood sugar by helping convert stored energy into usable fuel. It also supports immune function by promoting the production of immune cells.
For your brain, B6 plays a direct role in producing neurotransmitters, the chemical messengers that regulate mood, sleep, and focus. It also helps keep homocysteine levels in check. Homocysteine is an amino acid in the blood that, when elevated, is linked to cognitive decline and cardiovascular problems. Eating a banana as a snack or with breakfast gets you a significant chunk of your daily B6 without any planning.
Vitamin C
A medium banana provides roughly 10 mg of vitamin C, which works out to about 11% of the 90 mg daily value. That’s modest compared to citrus fruits or strawberries, but it still contributes to your daily intake, especially if you’re eating bananas alongside other fruits and vegetables.
Vitamin C supports your immune system, helps your body absorb iron from plant-based foods, and acts as an antioxidant that protects cells from damage. It’s also essential for producing collagen, the protein that keeps skin, tendons, and blood vessels strong.
Folate and Other B Vitamins
Bananas contain folate (vitamin B9), with one medium banana providing about 24 micrograms, or 6% of the 400 mcg daily value. Folate is critical for making DNA and forming new cells, which is why it’s especially important during pregnancy and periods of rapid growth. While 6% isn’t a major contribution on its own, it adds up when combined with other folate sources like leafy greens, beans, and fortified grains.
Bananas also contain smaller amounts of riboflavin (vitamin B2) and niacin (vitamin B3). Neither is present in large quantities, but both play roles in converting the food you eat into energy your cells can use. Riboflavin also helps maintain healthy skin and eyes, while niacin supports your digestive system and nervous system. Think of these as bonus contributions rather than primary sources.
How Ripeness Affects Vitamin Content
The vitamin profile of a banana isn’t static. It shifts as the fruit ripens. Research on banana cultivars at different ripening stages, from mostly green to fully yellow with brown spots, shows that vitamin C (ascorbic acid) levels vary noticeably depending on ripeness. The concentration of ascorbic acid in banana juice ranged from 0.45 to 1.40 grams per liter across cultivars and ripening stages in one study examining this relationship.
Generally, greener bananas tend to retain more vitamin C, while overripe bananas with brown spots may have lower levels because vitamin C degrades with time and exposure to oxygen. If maximizing vitamin C is your goal, eating bananas when they’re yellow with minimal brown spotting is a reasonable middle ground between taste and nutrient density. For B6, the changes during ripening are less dramatic, so the timing of when you eat your banana matters less for that particular vitamin.
How Bananas Compare to Other Fruits
Bananas aren’t the richest source of any single vitamin except B6, where they genuinely stand out among common fruits. An orange delivers far more vitamin C. Avocados (technically a fruit) provide more folate. But few fruits offer the same combination of B6, vitamin C, and folate in one convenient, no-prep package.
- Vitamin B6: Bananas provide 25% DV per fruit, compared to roughly 5% from an apple or 4% from a cup of grapes.
- Vitamin C: At about 11% DV, bananas trail oranges (roughly 78% DV) and strawberries (roughly 108% DV per cup) by a wide margin.
- Folate: At 6% DV, bananas are a minor source compared to a cup of cooked spinach (66% DV) or a cup of lentils (90% DV).
The practical takeaway: bananas are a reliable, everyday source of B6 that also chips in smaller amounts of other vitamins. Pairing a banana with foods that are stronger in vitamin C and folate, like a smoothie with spinach and strawberries, gives you broad coverage without overthinking it.