I've heard that it can be kept out for a certain length of time prior to mixing. Around 30 days. I won't do it. Mine will go in the fridge as soon as it comes out the mailbox. Bought a baby fridge for my closet so there won't be any unwanted movement of my hgh. It's a possibility when it's in the kitchen fridge and the wife is moving food around. I treat it like it's nitro-glycerine. Boooomm!! I don't want it fucked up. It's too expensive.