Peeling any citrus is optional and depends on your personal preference. If you do not mind the slight bitter taste, feel free to keep the peel on. If you prefer to peel the citrus, try to keep as much of the white pith on as possible since it contains nutrients that help your body absorb the vitamin C and other amazing antioxidants found in citrus fruit. You can keep the seeds as they contain excellent nutrients as well. Cut to fit your juicer and juice.