I compiled a list of what potions Jekyll gives you from all the standard herbs.

 

I have not tried any of the quest related herbs but i'm not so sure they would work. :-s

 

 

 

• No Herb - Strength (2)
   
  Guam Leaf - Strength (4)
   
  Marrentil - Antipoison (4)
   
  Tarromin - Attack (4)
   
  Harralander - Restore (4)
   
  Ranarr Weed - Energy (4)
   
  Toadflax - Defense (4)
   
  Irit Leaf - Agility (4)
   
  Avantoe - Super Attack (4)
   
  Kwarm - Super Energy (4)
   
  Snapdragon - Super Strength (4)
   
  Candantine - Super Restore (4)
   
  Lantadyme - Super Defence (4)
   
  Dwarf Weed - Magic (4)
   
  Torstol - Does not accept

 

Might be useful to attach it to the Jekyll/Mr Hyde Random event?

That's for another Crewbie to decide if it should be put into the Random Event Guide, but as someone who works on the Bestiary, I'd be happy to list this. I actually prefer just giving him a herb. Less hassle, you get a better potion... :-k

 

 

 

Summed up though:

 

 

 

You can give Jeckyl the highest level herb you currently have in your inventory. Doing so will cause him to give you the first potion of the next level herb (for example, giving Snapdragon will cause him to give you a Super Strength Potion). Because of this, Torstal isn't accepted.

 

 

 

EDIT: Added. Thanks from the Bestiary Crew :)

According to the list above, he cheats you on ranarr and above, actually, giving you a lower potion. I know cos he did it to me, lol!

I always give him my cadantines if i'm near a bank :D