I can't take anything like this because my irregular heart problems. I don't feel after educating myself on energy supplements these are the best for anyone to take. Go to the doctor have blood work done to see why your energy is so depleted. I get vitamin b12 shots once a week. I actually give them to myself so it makes it much more convenient. I am a Radiographer, but your doctor can show you how to give yourself a shot or if you feel better going in to the doc office once a week for the shot you can also do that. I don't recommend this product at all!