Potions - Most can be bought at the Potions shop in Illien
 
-Narrow M- Healing 3 (Not worth bothering with - buy Healing 5)
-Wide M- Healing 5 (Useful in combat; but camping is a more cost-effective
    way to heal wounds if you don't have to buy rations)
-D- Neutralize Poison (A good one to stock up on, especially if you have
    an unreliable Paladin as your healer)
-Butterfly- Spellpoints 1 (Pretty worthless because it's so weak)
-X with crown- Spellpoints 2 (Most valuable potion available in unlimited
    quantities! If you can afford to stock up on these, your Black Wizard
    can keep pumping out those high-powered spells that devastate the
    opposition)
-Reverse F- Heal Sickness
-Half up arrow- Heal Blindness
-P- Heal Stun
-<- Youth (Rejuvenation - reduces age by one year)
-q with curl- Weapon Balm (Another valuable potion! This one is only
    available in limited quantities. When applied to a weapon, it increases
    hit points from 1-5. You should save before using it, and not accept
    less than a 3 point gain)

Herbs can be bought at the Herb Shop in Illien. Herp packets can be bought
from the Snakesign Merchant.
 
Dolden (Lily) - Cures poison
Drelben (Clover) - Cures paralysis
Redplant - Cures Ageing
Blueplant - Cures Madness

Packet of Herbs - Cures Disease