Proctor says to only use it for one month, and if you still have some left over you should finish it as fast as you can. Is this for financial interest. or does the Proxiphen losE from it's efficiency?
I contacted them about this topic and have looked for their email reply which says, "A year or two at room temperature. Longer in the refrigerator. Also, it may turn brown. This does not affect its activity".
