I have used the injection and it sometimes does wonders and sometimes I don't know the difference. Try it for a week and then try without it for a week. If you notice the difference it's for you.

The good thing is that you won't overdoes on the stuff. The body excretes the rest. So for about pennies a day injectable you can't go wrong.

It's especially effective if you don't eat a lot of red meat, are from the Mediterranean or from the Caribbean people from there have blood issues small and great that require additional B12.

Gsleepy echoed what my GP said when he gave me a b12 shot... "If you are low then you will notice a difference."

I take an oral multivitamin with 833% DV of B12 every day and felt nothing.
My wife, who does not take multivitamins, felt energetic for about 2 days.

I use it myself and believe in it... especially the injectable kind!

If you are low then you will notice a difference IMO