Low energy is one of the most prevalent health complaints. If you have tried various ways to boost your energy and still feel lethargic, you may be suffering from vitamin B 12 deficiency. Vitamin B12 is a key factor in the formation of red blood cells and the production of energy in the cells; yet this nutrient is often overlooked. In the short term, insufficient vitamin B12 levels can result in deep fatigue, weakness, problems concentrating, shortness of breath, and mood changes, which prevent you from feeling and performing at your best. In the long term, vitamin B12 deficiency can lead to more severe nerve-damage symptoms, including numbness or tingling of hands and feet, poor sense of balance, depression, dementia, and loss of mental abilities. Vitamin B12 supplementation is recommended at any age, but can be beneficial for people who have a vegetarian or a vegan diet and older people who suffer from age-related degenerative conditions. Supplements are a convenient way to ensure adequate vitamin B12 levels and high-potency formulas are an ideal alternative for people currently receiving injections.