Guys, I try to say this every time there is a good bulk sale going...don't be afraid to load up on Muscle Chemistry's IGF-1, that shit stays good for a long time!!! I keep mine in the fridge and use it slowly, because a little goes a long way. Then I'll go off cycle and not use it for several months. I've used it a year after I've bought it SEVERAL times over the years and it is always very potent!