This item is no longer available in game.
This was the original Potion of Luck made by alchemists. It was replaced early on in Mists of Pandaria with a new version that had 1/3 the duration and cooldown. Any existing potions prior to the change were not removed, but you could no longer make them and they were renamed to Greater Potion of Luck.
Unfortunately, both this and Potion of Luck are being deprecated in Legion.