should I dilute IGF

Don't put water in the bottle as Press said. It will destroy the fragile peptide and degrade it very quickly. If you must "cut" it - draw up the IGF and then an equal amount of sterile water in the syringe. Even then I would worry about ruining it as I don't know how quickly it can damage it. I would use it straight up. If you put it into a muscle it shouldn't hurt at all.
 
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