vitamin b12 injections are 100% better than the oral version. You only get around 5-10% of the b12 with the oral, injectable u get 100% b12. On cycle i take 500mcg eod. Vitamin B12 is not a vitamin that the body naturally produces, so it must be consumed from foods and supps. It is essential to supporting good health because it plays a role in the health development of red blood cells and bodys growth. Gives u natrual energy, and helps keep ur appetite strong. If ur lookin for some, chemicalneed.com has it.