You regain 1d4+1 levels worth of spell slots when you drink this potion. The potion's blue liquid glimmers when agitated.
When using this type of potion for every 3 levels of spells regained the user will incur 1 point of exhaustion. This effect is cumulative with other potions of this type. A long rest resets this limit.
In addition, regaining more spell slot levels than you are missing requires you to roll on the Wild Magic Surge table.