Medical Definition of melanin. : any of various black, dark brown, reddish brown, or yellow pigments of animal or plant structures (as skin, hair, the choroid, or a raw potato when exposed to air); especially : any of numerous animal pigments that are essentially polymeric derivatives of indole formed by enzymatic modification of tyrosine.
An intermediate- or long-acting insulin is often prescribed with NovoLog. NovoLog can be mixed with insulin NPH (intermediate-acting insulin), but always draw NovoLog into the syringe first. Never mix NovoLog with Lantus. Do not mix NovoLog with other insulins if using an insulin pen or external pump. Do not vigorously shake insulin before use.
1 If you are mixing Novolin R with another insulin, draw Novolin R into the syringe first. Inject the dose immediately after mixing, as directed by your doctor.  Use the proper technique taught to you by your doctor. Inject deep under the skin, NOT into muscle or a vein.