Potium on orange juice label?

I have low potium and always have orange juice in the fridge. Recently I went to CVS and bought a ton of OJ and upon getting home noticed that potium was not listed on the nutrition facts. The OJ tasted as though it had "less bite" and I know potium has a certain tang to it. It was my understanding that all OJ had potium. Have I been stuck with a 2 week supply of low grade OJ?