It is a narcotic and may cause withdrawal symptoms if it is stopped too abruptly. Although Norco withdrawal can be quite unpleasant and uncomfortable, you can be assured that it is not life threatening. Norco withdrawal is possible in people who abuse Norco and in people who take Norco for a legitimate medical use.
Definition of melanin for English Language Learners. : a dark brown or black substance that is a natural part of people's skin, hair, and eyes.
Mary Smith. Melanin is a natural substance which occurs in the body to create the pigment in our skin, hair and the iris of our eyes. Moreover, it protects the skin from UV rays and, when levels rise, our dermis darkens to give us that desirable suntan.