While typically bright yellow, it is possible for them to change to green, red, or orange as they ripen.

A mature fruit will be about 2–3 inches (5–8 cm) in length and have a curved shape and yellowish colour similar to a banana, giving rise to the fruit's common name.

[3] Raw banana peppers contain 92% water, 5% carbohydrates, and negligible fat and protein (table).

They are rich sources of vitamin C, containing 92% of the Daily Value (DV) in a 100 gram reference amount (table).

Vitamin B6 is present in substantial content of 21% DV, with no other micronutrients in appreciable amounts (table).