Perfect if you enjoy an active lifestyle, vitamin B12 reduces tiredness and fatigue, supports energy metabolism and aids psychological function. These handy tablets from Swanson Health are each packed with 2500µg of vitamin b12 as methylcobalamin, and also support normal functioning of the immune system. Perfect if you enjoy an active lifestyle, vitamin B12 reduces tiredness and fatigue, supports energy metabolism and aids psychological function. These handy tablets from Swanson Health are each packed with 2500µg of vitamin b12 as methylcobalamin, and also support normal functioning of the immune system. Complements a well-balanced diet. 2500µg of Vitamin B12 per tablet. Vitamin B12 reduces fatigue, supports energy metabolism and aids psychological function. Vitamin B12 supports normal immune function. 60 tablets per pack Methylcobalamin is a type of Vitamin B12. A vitamin known to contribute to the normal function of the immune system. Order your supplements right away.