When I juice some fruits and vegetables, how long before it starts to lose its potency in my fridge?

I always recommend drinking juice as soon as its made for highest nutritional value. It starts to "degrate" immediately after its made, much like an apple turns brown, once cut open.

I generally drink juice RIGHT after its made.. If for some reason, I need to store it, I do not store juice for over 24 hours. If storing be sure to store it in a sealed container with NO excess air space in the fridge.