OP is correct about poison potion effect, whether it's used for poisoning humans or healing undead.
![[Linked Image]](https://s5.postimg.org/4czu9dnw7/2018-01-03_014137.png)
As to the Five-Star Diner, it works correctly on healing potions for me - it doubles the vitality restored. The image below shows FSD + Living Armor with a large healing potion.
![[Linked Image]](https://s5.postimg.org/nuuhpd2uf/2018-01-03_020019.png)
