Copper, EU NRV (Nutrient Reference Value) 1mg per day
Copper is the third most abundant dietary trace metal after iron and zinc. It is a component of certain enzymes and is needed to produce red and white blood cells. The body also needs copper to utilise iron efficiently and for the immune system.
Dietary induced copper deficiency is extremely rare due to the plentiful supply in the diet and the high efficiency of absorption.
Copper is found in a wide variety of mineral salts and organic compounds as well as in the metallic form. Having 1mg or less a day of copper supplements is unlikely to cause any harm.