I won't try to address the humidity issue but rather the difference between food grade and phamaceutical grade supplements. We have a "Medical" store in our town where I bought a bottle of something, I forget. The price was so high that I must have shown reaction or actually fainted on the floor. The salesperson reassured me that the difference in price was because their products were pharma grade. To flip the coin over, my Chiro dispenses Swanson supplements and he stays on the computer constantly and always appeared to be on top of anything nutritional. The whole mess gives me a headache. There definitely needs to be a consumer reports for supplements that is independently funded. As for the humidity, perhaps Tupperware (burp and seal) tub for the supplements kept in the fridge? Best in the new year, Ken in Texas.