Zinc deficiency is estimated to affect billions of people worldwide, especially the elderly and children in developing countries, pregnant women, vegan, and vegetarians. Zinc is considered deficient if plasmatic levels are below 60 mcg/dL. In Italy, the recommended daily allowance for zinc is 3 mg/day for infants below 12 months of age, then it raises gradually to a recommended intake of 9–12 mg/day for adolescents and adults [230].