Webster Dictionary(0.00 / 0 votes)Rate this definition: Melanin(noun) a black pigment found in the pigment-bearing cells of the skin (particularly in the skin of the negro), in the epithelial cells of the external layer of the retina (then called fuscin), in the outer layer of the choroid, and elsewhere. It is supposed to be derived from the decomposition of hemoglobin.
How to prepare your insulin dose if you are using two types of insulin: 1  When you mix regular insulin with another type of insulin, always draw the regular insulin into the syringe first. When you mix two types of insulins other than regular insulin, it does not matter in what order you draw them into the syringe.
Best Answer: Regular human insulin starts in 30 minutes and lasts about four hours with a peak between 1 and two hours. There are faster rapid insulins that work in 10 minutes. Common brands of regular human insulin are Novolog, type R, Humalog, and Novolin. Intermediate insulin like NPH takes two hours to start working, rises steadily to a peak in 9 hours and back down at the same rate for a total of 18 hours.