The Life Potion is an evil elixir used by Sarah, Mary, and Winifred Sanderson. Rather than granting the drinker life, it instead allows others to suck the drinker's life force to replenish their youth.
Recipe Life Potion:
Bringeth (bring) to a full rousing bubble, then add two (2) drops oil of boil and a dead man's toes. Next add a dab of [green] newt saliva, dash of pox stir thrice (3 times). One final thing and all is done. Add a piece (spit) of thine (your) tongue.
In the movie winifred sanderson sase: Mix blood of owl with the herb that's red. and Turn three times, pluck a hair from my head. as part of the recipe but it isn't in the spellbook.