Green, sweet bell peppers have 2 times as much vitamin C as oranges; red and yellow bell peppers have 4 times as much.
The color can be green, red, yellow, orange and, more rarely, white, purple, blue, and brown, depending on when they are harvested.
Most varieties of colored bell peppers will turn from green to red as they ripen, but some turn yellow, purple or even brown. As peppers ripen, their sugar content increases. Some yellow and red varieties are the only peppers that are the same color in both the immature and mature stages.