Recommended daily intake of vitamins and minerals - Lenntech Excess manganese may hinder iron adsorption: Molybdenum: 75 µg: Doses larger than 200 µg may cause kidney problems and copper deficiencies: Nickel < 1 mg: Products containing nickel may cause skin rash in case of allergies: Phosphorus: 1000 mg: Contradiction: the FDA states that doses larger than 250 mg may cause stomach problems for sensitive individuals: …