Not only is vitamin C one of the most effective when dealing with warding off colds and the flu, it is also incredibly helpful when targeting acne. This is why incorporating orange peel oil into your skin care regimen will undoubtedly have positive effects on your face. What's so interesting about this oil is that it is derived from the peel itself and not the fruit, this is because while an orange has an enormous amount of vitamin C within it, the peel actually has 10 times that amount.