It is important to routinely test for vitamin and mineral status in the body to avoid prolonged deficiencies
It is advised that you undertake a routine blood test every year.
When deficiencies are severe, you will most likely need a supplement for a few months until the deficiency is overcome.
With time, you can continue to include certain foods in your diet that are known to have high amounts of certain vitamins and minerals to prevent deficiency and in return avoid going back to taking supplements.