Your best option is to shoot the IGF1lr3 straight after the muscle have been trained, as your receptors will be primed to uptake the most at this time.
For a small muscle like biceps and triceps 30-40mcg (split between both sides) is enough. If you shoot quads or hams you can up the dose to 40-60 mcg, it all depends on how big you are. Do not shoot the same muscle again for 72houres, as this is how long it will take the receptors to be "open" for another dose. If you shoot to much igf1lr3 and have already filled all open receptors, it will bind to the receptors in your intestine, and you will end up with a permagut!!! Not pretty !!!
Don't forget to take in extra carbs when on igf1, as you don't want to end up with to low blood sugar ( don't forget the I in IGF1, stands for insulin)
A shake with 50g fast carbs & 50g whey protein straight after shooting is a good idea, followed by a meal within 45min.