i have farmed for almost a week now for about an hour or two a day in tainted fen trying to find vitality potion 6 it does not drop.

i dont think its just my luck because i have tried farming with 30% drop rate etc.
+ i have collected many each of the other recipes that the same mobs drop.
+ i have collected enough dna from the mobs to splice 6 times already.
if i had to estimate how many mobs ive killed looking for the loot it would be close to 5000

its not a rare or unique recipe its just normal.
but its drop rate is so far a 0%
i also have not seen one in AH.