I have a few bottles of vitamin D in reserve in my kitchen cabinet. We've had alot of humid weather and I noticed that when I tip the bottles upside down, the pills stick to each other and the bottom of the bottle. The is despite the fact that the bottles are still factory sealed, so I don't know if it's from humidity or not. On the label, it says to store in a dry place. Well, the driest place I can think of is the refridgerator because of the constant "air conditioning" that goes on in there. A humidity guage shows humidity to be under 15%, so it's perfect. But is it wise to store them in a place that cold? I don't want to degrade the effectiveness of the Vitamin D by having them in either a too humid or too cold of a place, but I'd just like to know if either one of those things would actually have an adverse effect. Does anyone here know?