Storing Plennyshake in fridge for 6 months

Is it a bad idea to store Plennyshake-bags in the fridge for 6 months?

I have a very large buffer of plennyshake bags. I have bags that I wont be using for 6 months that i am currently storing at room temperature, which in my case means it fluctuates between 15 and 22 degrees.
My assumption is that this degrades the vitamins and potentially other ingredients. And since I only eat Plennyshakes I am worried this might lead me to certain nutritional deficiencies.

Would it be better to store them at 5 degrees in a fridge? Or is 5 degrees too cold and damages the ingredients? (probably a dumb question) Or is it a bad idea for some other reason I cant think of?

I was planning to put any new plennyshake bags I get in the fridge immediately. And once I take them out to just keep them outside the fridge until I empty them, because I think putting an opened bag back into the fridge could cause condensation to form inside the bag.

Or is it just complete overkill to keep the bags in a fridge, and storing them at room temperature for 6 months has no meaningful degradation to the vitamins and other ingredients?

You can safely trust the best before dates, as long as you keep them in a dark place that is not humid.

We test our products to make sure they keep their best-before date promises, so rest assured.