Ok, I'm with the same problem here, I have 3 vials of 1500Ui plus the water that comes in the other vial (the Hcg comes in powder and it is mixed with the water) and only want to take 500ui each time. Can I put it all (1500ui) in a syringe, shoot 1/3 and then put the rest in the fridge? The next time I'd use it, I'd change the pin and shoot. Is it ok like this?