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.
Melanin is a pigment that affects your skin to keep it the color it is. Melanin is brown. The more melanin in the skin, the darker the colour of the skin is.Melanin helps the â¦ skin by protecting it from the UV rays of the sun. Albinos are prone to a variety of skin diseases.  Melanin are the cells in our skin that are colored. They are the color pigmentation that we have.elanin is brown. The more melanin in the skin, the darker the colour of the skin is. Melanin helps the â¦ skin by protecting it from the UV rays of the sun. Albinos are prone to a variety of skin diseases.   Melanin are the cells in our skin that are colored. They are the color pigmentation that we have.