<prompt> All are advantages of Zinc therapy for Wilson disease:It is nontoxicProduces positive copper balanceBlocks intestinal absorption of copperInduces hepatic metallothionein synthesis  <response>: Zinc treatment in wilson disease: It is efficient in Wilsons disease Nontoxic Produces a negative copper balance by blocking intestinal absorption of copper It induces hepatic metallothionein synthesis, which sequesters additional toxic copper Ref: Harrison, E-18, P-3190. 