Bananas are not considered a high source of vitamin K. Their main nutritional contributions are typically potassium, carbohydrates, and some B vitamins. If you are aiming to increase vitamin K intake, focus on leafy greens (spinach, kale, broccoli, parsley) and—if appropriate—K2 sources from fermented foods. Bananas can still be a convenient, well-tolerated fruit for energy and overall diet variety; the key is building a consistent, diverse eating pattern rather than relying on one food.