Unfortunately, due to many different factors Vitamin B12 deficiency is a common and growing problem today. Both adults and children often find themselves with signs of a Vitamin B12 deficiency without realisation. A deficiency may show as signs such as mental fogginess, poor memory and concentration, fatigue, irritation, feelings of apathy and lack of motivation, mood swings, muscle weakness, or sleeping problems. Lack of this vitamin may also contribute to weakened immunity. Vitamin B12 is important for good mental and physical health. It is one of the largest and most complicated vitamins that is only produced by certain probiotic bacterial species. In the body Vitamin B12 is used in DNA, working with other B Vitamins to form the different types of blood cells. It contributes to normal brain functionality, immune system, energy production, and the metabolism of fats, carbohydrates and proteins. Contributing to the heart and cardiovascular system by maintaining normal homocysteine levels. Benefits Contributing to normal energy-yielding metabolism and the functioning of the nervous system Contributing to normal homocysteine metabolism Contributing to normal psychological function Contributing to the normal function of the immune system Contributing to the reduction of tiredness and fatigue