Spend a Healing Stirge!

The title of this blog comes from the horrifying yet amusing idea of using Stirges as health injectors, somehow reversing their blood-sucking abilities to bestow hit points instead of damage. Every well-equipped adventurer would carry a few Healing Stirges™ for those unexpected emergencies. Simply stick the needle-like proboscis into your arm, squeeze firmly, and presto! Instant transfusion!

As an aside, if an alchemist or artificer were to make actual mechanical syringes in the D&D universe, they could look like Stirges. After all, the basic idea behind the creatures is exactly the same (though reversed in function).