I have had my third lipotropic B12 injection thus far. Dosing is 1ml every 3 days, and I have yet to see/ feel an increase in energy. Based on my experience, I have not seen any benefits.
I've used b12 injections and I felt as like I had a good overall sense of well being when taking them. My skin seemed clearer and I just felt good. I think people could feel differently when taking them. I can see if a person is deficient in b12 taking them would probably make them overall feel better vs someone who is not. IMO
B12 has a horrible oral bioavailability too the point alot of people are deficiant and injections make a huge difference . It plays a huge role in metabolic function and energy so any serious athlete would benefit