Vitamin b12 is found mainly in animal based foodstuffs such as meat which is why it is often chosen as a regular supplement by vegetarians and vegans. It is essential for normal red blood cell formation and contributes to the normal function of the immune system. And like most b vitamins it contributes to normal energy metabolism the processes that release energy from foods. It is often recommended as a supplement for the elderly who may have a compromised diet. This is a high strength product delivering a full 1000µg of vitamin b12 per tablet. Lamberts quantity – 60 tablets vitamin b12 1000ug.