Boost Potion Share is a Lunar spell that allows the caster to share certain potions. When cast on almost any non-barbaric potion in the caster's inventory, the potion's effect will be shared with up to 4 other players in a 3x3 square area around the caster. Any target of this spell must have Accept Aid turned on. The player casting the spell will also be affected by the potion without using an additional dose of the potion. For example, a 1 dose potion can boost both the caster and 1 other player.

This spell cannot be cast in Castle Wars and will result in a message saying "You don't want to help your enemies". It also cannot be used with the following potions:

• Zamorak brews
• Saradomin brews
• Combat potions
• Guthix rest potions
• Untradeable potions of any type, such as absorption or overload potions

A Magic level of 84 is required to cast this spell, giving 88 experience. It requires 3 Astral runes, 12 Earth runes, and 10 Water runes to cast.