A medium-sized orange typically contains between about 53 mg and 83 mg of vitamin C, which covers roughly 90% or more of the recommended daily intake for most adults. For example:

• One source states an orange has about 53.2 mg of vitamin C.
• The USDA reports a medium navel orange contains around 70 mg of vitamin C

• Other sources indicate a range from 60 to 83 mg per medium orange

• One medium orange (about 140 grams) provides approximately 92% of the daily value for vitamin C

The exact amount can vary depending on the orange variety, size, and seasonal factors, with some types like Natal oranges ranging from about 21 to 84 mg per 100 mL of juice

. Overall, eating a single medium orange nearly meets the daily vitamin C requirement for most adults. Vitamin C from oranges supports immune function, collagen synthesis, iron absorption, and acts as an antioxidant