There is little known about nickel but there is approximately 10 mg of it in the adult body. It was proven to promote bacterial growth in 1965 but there has not been any solid evidence that nickel is essential to the human body.
This mineral may be involved in the protein structure and function of genetic material. It is believed to have a role in hormones and glucose utilization.
For adults, it is recommended to have an intake of 0.2-0.7 mg of nickel per day.
No deficiencies have been reported in humans, although it is thought to result in depressed growth and depressed haemopoiesis, the formation of blood cells. Symptoms in animals are decreased growth, dermatitis, changes in pigment, liver damage, and impaired reproductive function.
Sources in the Diet
Vegetables are known to have higher amounts of nickel such as spinach, lettuce, and even nuts have nickel. Baking powder and cocoa powder have high amount of nickel as well.