I take a BN-12 injection every week, and there is no doubt it accounts that i walk with a bounce. There is a medical organization on anti aging which I subscribe to many of what they recommend. They recommend taking one additional shot per week for every decade that you age beginning at age 60. I am 92 so that is the reason that i take a shot s week.My doctores always comment on my vitality. There are many other things that you can do so i refer you to the Journal "Life Extension". It is worth looking into.