There are no known cases of silicon deficiency. It is thought that symptoms of a possible deficiency are certain joint disorders, due to silicon's role in bone and cartilage composition. Safety Silicon is not usually taken as a supplement on its own and is best taken in the form of a multivitamin and mineral supplement. No estimated safe and adequate daily dietary intake has been established. It plays a role in regulating blood pressure, and aids in the conduction of nerve impulses and the control of muscle contraction.
Sodium is abundant in most foods except fruit.
Rich sources are common table salt, seafood, meat, poultry, milk and eggs. A low sodium intake through food probably never occurs, except in the instance of dehydration through vomiting, diarrhoea or profuse sweating. Where you get it Meat, poultry, fish, eggs, milk, cheese, broccoli, cauliflower, legumes and nuts. Deficiency Deficiencies are extremely rare and adequacy is related to a person's protein intake.