Zinc/Copper deficiencyUpdated 2 months ago

Typical diets in the US meet or exceed the copper RDA. 

Deficiency can occur with intake of zinc at 60 mg per day for more than 2 months.1 This is why the upper limit for zinc was set at 40 mg per day except when taking acutely.

1. Institute of Medicine. 2001. Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc. Washington, DC: The National Academies Press. https://doi.org/10.17226/10026