This is a game designed around the idea of making tough decisions, and dealing with consequences. All the most powerful potions have a tradeoff, that you will have to consider. There is no magic bullet for magic health regen or insta heal. This is entirely by design. If Swallow *did* scale in effectiveness to the point where it was just as useful at higher level, as it is at the lowest levels, it would have a significant drawback, and it would be called Gadwall.