If in the current state it should be added you shouldn't be able to bandage until at HP cap. When at HP cap you could bandage and it would take a couple minutes so it wouldn't just get abused mid fight.   If you wanted to add a new system. Maybe if you hit red HP you had to go see a "doctor" but if you was still in the green, maybe a "first-aid kit" could heal you back up in turn for it taking maybe 5 minutes or something and consuming the item.
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