I preload my peptides into a syringes and use it a few times before I preload another. I do IM injections and I got blood in the first shot will this effect my peptides?
I would never reuse syringes for IM Just spend the extra 10 cents a shot and toss the bloody syringe and stop reusing for safety's sake.
I would discard that syringe. Even though blood is considered sterile we don't know what happens when it stats to degenerate.