Hi Rosanna,
I do not think that it is good to take the tub out of the fridge for each use. I think it can lead to condensation. I do not see this as an issue for encapsulated NMN which I store in the fridge for daily use. Relatively, airtight bottle backed up by relatively airtight capsule.
Right now, my refrigerator is 34.2 degrees and 37 % humidity. I use Prohealth, My concern with the tub which is not completely filled is that I do not see how the design keeps it airtight once it is opened. If I remember correctly Alive's is a smaller tub. Maybe the lid is designed to seal well. For Prohealth, I transfer a couple weeks worth into a tiny mason jar with blue painters tape wrapped around it to keep light out. I keep that in a dry, cool closet for daily use. I put a little plastic wrap on the top of the tub before putting the lid on for cold storage. But, my last purchase was for a 100 gram bag. I keep that frozen for refilling my jar. I let it come to room temperature before transferring from the bag. Then I put it back in the freezer.
Good luck.