The Niacin are a humanoid species. The Niacin were humanoids with smooth blue-green skin, red eyes, lipless mouths and long thin noseless faces. Olfactory glands beneath their eyes were responsible for their sense of smell. Both females and males were bald, though both genders were easily distinguished. Their large red goggle-like eyes also had slit pupils. The Oritixx were closely related to the Niacin.