Not too little, not too much, but just right

The history of Wilson disease

“…[83] Thus, the goal is to return copper metabolism to as normal a state as feasible, since copper is important for so many cellular and metabolic mechanisms. Our esteemed series editor has reviewed this in his Landmark article in HEPATOLOGY, [107] quoting John Walshe's 1995 publication, [108] "Not too little, not too much, but just right." The emphasis of this history and other articles on the toxicity of copper "should not detract from the fundamental importance of copper to life.…”