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To review the toxicity and risks of free copper in Wilson's disease, Alzheimer's disease, other disease of neurodegeneration, and cognitive loss in the general population. We will also review the anticopper drugs and how lowering free copper levels with an anticopper drug inhibits fibrosis, inflammation, and autoimmunity.Some exciting recent work indicates that free copper levels are increased in Alzheimer's disease, and copper may be involved in disease pathogenesis, opening the way to possible therapy of Alzheimer's disease with anticopper drugs. Copper may also be involved in other diseases of neurodegeneration. A very exciting recent study indicts high intake of copper, mostly from copper supplements, in conjunction with a high-fat diet in more rapid cognitive decline in the general population. Other data indicate that even low levels of copper in drinking water, perhaps similar to copper supplements, bypasses the liver, enters the circulation, increases the blood–brain penetration of copper, and may cause damage.Some of the implications are that Alzheimer's disease and other diseases of neurodegeneration and fibrotic, inflammatory, and autoimmune diseases may be treatable by lowering the availability of free copper. People in the general population may wish to take steps to lower their free copper levels and, in particular, to abstain from taking copper supplements and ingesting significant amounts of copper in drinking water.