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.
Hereâs what you need to know about basal insulin, and why itâs important for managing diabetes. There are two main types of basal insulin: Intermediate-acting insulin, NPH (Humulin and Novolin), is administered once daily. It works hardest 4 to 8 hours after injection and then starts waning around 16 hours.