Whether or not you choose to refrigerate your K2 is entirely up to you. Though not necessary, it will not hurt the product to be refrigerated. 

If you tend to use your K2 quickly or you live somewhere with a cooler climate or can store it in a cool, dark cabinet or pantry, you shouldn’t need to refrigerate it. But if you go through it slowly, or live somewhere with a warmer climate, keep it in the fridge. Know that if you choose to keep your K2 stored in the fridge, that it may likely go cloudy; a few minutes at room temperature should help revert it back to its natural state. Before taking, make sure that the K2 has returned fully to room temp to ensure no separation of the contents. 

Please do not hesitate to let me know of any additional questions or if you need further assistance.