I can't for the life of me figure out the use. You get a few seconds extra HP WITHOUT HEALING UP THE ADJUSTMENT so it is useless in every bit of content right off the bat. If it healed you up the dif in HP, I could see it be somewhat useful for surviving a TB maybe but oh my gods, what a waste of resources of having a new 'better' version of something that will never be used each expansion.
And no, it being used as a healing item is no reasonable arguement for allowing it to exist the way it currently is. Have the potion do something else than (de)buff HP or remove it all together.