I did B12 shots for my anemia and it definitely gave me more energy. My physician gave the shots to me.
I've also taken specific B vitamins for anxiety/stress and it worked when I found the correct dosage. it wasn't some bottle sitting on a shelf that had lost its potency, even if the date said otherwise, I special ordered it after researching it. But that's just me, I have a high tolerence. it did not help the panic attacks. But I was in a state of fear/panic through out the day and worse at night.
I used to drink one of the shakes gold's gym made and I felt great afterwards. I bought all the same items and made it every AM. I felt really alive. I could feel the oxygen in my body and it was as if my blood stream felt very alive.
I am just about off all meat and poultry, fish, etc. I would (and will start again) have a shake of spiralina (again, fresh Hawaiian) not from a bottle and my brain and body felt clear. and, of course, fresh salads, etc. In planting seasons, only fresh. And of course, no alcohol or recreational drugs.
I found it just wasn't enough to just have vitamins, but to take total care. I certainly feel the difference when I don't, sluggish, brain dead, etxc. BUT that's just me, and I've rambled on, sorry.
Looking forward to get past thanksgiving to get back on track.