Mango is one of the most potent sources of naturally occurring vitamin C, with one serving boasting a whopping 76% of your daily needs. They're also a good source of vitamin A (25% DRV), fiber (3 grams), and only have about 100 calories per serving. Pineapple is also an impressive source of vitamin C, plus has a ton of the antioxidant manganese. It is often used as a medicinal plant around the world because the enzyme bromelain is a powerful anti-inflammatory. While both fruits are somewhat high in sugar, they're perfectly healthy to eat in moderation. You can feel great about drinking one of these smoothies every day of the week if you so choose!