Manganomanganic oxide is an oxide of Mn (II,III) with is formula of Mn3O4. It was proposed as a food supplement for prevention of manganese deficiency in animals and fish. The manganomanganic oxide Elkem Agrimax contained a lead mixture, and because of it was not approved for animal use by Scientific Committee for Animal Nutrition

There is no information about biological or medical application of ferrous oxalate. But is known, this substance is an insoluble in water.

There is no information related to the pharmacological activity of COBALTOUS OXALATE (cobalt oxalate), but is existed a mention about biological activity, where were investigated the role of anions, such as sulfate, nitrate, oxalate and acetate on pharmacological properties of metal (including Co), these complexes have been screened against bacterial species, Escherichia coli, Staphylococcus aureus and Pseudomonas aeruginosa and results have been reported. In addition is known that cobalt oxalate primarily used as catalysts.

Ni acetate is a water soluble salt of Ni, which leads to skin irritation, in particular to allergic contact dermatitis. May cause cancer according to animal studies. Symptoms of overexposure to nickel can cause sensitization, dermatitis, allergic asthma and pneumonitis.