Health "68 00 65 00 61 00 6C 00 74 00 68" will have it's own offset for the value it's been given so you can "NOP" it to never change up or down or you can ad a higher hex value "FF FF" depending on what comes up in the search, sometimes it's more simple that that and in file modding you can actually just make the value higher.
im thinking its not possible with all games as i done that and i can find health plus but there doesnt seem to be values after them to alter i will try another game mate cheers