Vitamin B12 is a nutrient that keeps your nerves and blood cells healthy. Not only is it critical to the creation and health of red blood cells (RBCs), it is essential for the production of all your cells' DNA. Kinda a big deal. 

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Additionally, B12 plays a critical role in strengthening nerve cells, helping protect against megaloblastic anemia — a disease that leads to extreme weakness and fatigue. 

Weakness and Fatigue. If you have a B12 deficiency, your red blood cells (RBCs) are unable to effectively carry oxygen to the other cells and tissues in your body, and you can become susceptible to nerve damage. Symptoms related include tiredness, moodiness, and tingling or numbness in hands and feet. 

We are all getting older! Vitamin B12 depletes as we age, but a good supplement will raise your vitamin b12 levels back to a healthy range.

Supplementation of B12 will help fight anemia or fatigue, especially in people on a vegan diet. It's important to supplement B12 because its almost exclusively found in animal products.