Also seen in lipotropic injections are B-12, a vitamin that boosts both energy and metabolism to help both with exercise and healthy eating.

You can generally get all the vitamin B12 you need from food, but some may need to take supplements, One type of B12 ...

B12 shots and supplements are safe to take for more energy and fatigue. Not everyone needs to take a B12 shot, however. Here's what you need to know.

And B12 injections are not going to give an energy boost, says Dr. David Baron, chief of staff at Santa Monica-UCLA Medical Center and Orthopaedic Hospital.

Like a toddler awaiting a set of booster shots, I fidgeted and focused, unhelpfully, on a long, thin needle in front of me.

Before I was diagnosed with a vitamin B12 deficiency, I had no idea the symptoms could be so severe. Five months later, I'm finally feeling better.