Many people have heard of B12 injections, but may not be sure what they are for or why you need them. One of the biggest hallmarks of aging is often a decrease in energy levels, and a corresponding decrease in metabolic rate. There’s no question that some of this is caused by hormonal changes – notably a decrease in estrogen in females, and testosterone in males – that is a typical part of aging. But it’s far from the only process at play with aging and feeling less fit, healthy, and active as you did when you were younger. Could B12 injections be the missing link in your anti-aging fight? Read our guide below, and we’ll take you through the basics of B12, B12 injections, and what they can do for your body.