The Saradomin bow has a special attack called Restorative Shot, which uses 55% adrenaline. It deals 100% weapon damage and heals the user twice the amount of damage dealt over time. When Saradomin arrows are equipped, there's a chance to deal an extra 100% weapon damage (Water spell damage), which also adds to the healing effect. The healing effect lasts for a minute and heals 20% of the damage dealt every 6 seconds.
There used to be a glitch in which the G.E shows that the Saradomin bow can fire arrows up to iron, while the knowledge base stated it can fire arrows up to dragon. Both are incorrect; it has been confirmed in the recent update FAQ that it can fire arrows up to rune. It also fires Saradomin arrows, Guthix arrows, and Zamorak arrows.