| Yeah, medisave is good for needles.
22G or 23G (the thickness of the needle) x 1" - 1.5" (the length) should be fine for injecting into quads or glutes.
400mg of deca will take up 4ml in the syringe so if you're going to inject in one go, your syringe will have to be a bit bigger than this to allow you to aspirate etc. |