Mana Potions replenish anywhere from 6-24 Mana Points. They are less effective than Full Mana Potions. They can only be crafted by clerics, but are helpful for all mage classes, especially in the heat of battle when mana is running thin. Oftentimes during bigger hunts, even the plates will carry Mana Potions with them, so that they can refill the mages' supplies during tight situations.
These potions are also popular amongst those with a low meditation skill level. They are also rather cheap to make, and can be sold for a decent sum. And as with all potions, they can be bought in the Potion Shop, and only up to twenty may be carried at one time.