What I experience, if I stop for two days, is severe pain in my back (another weak link in my system-due to an accident in my youth). Well then there is the increased irritability. :-)

So, I haven't stopped my B-12 injections for more than a day for quite some time.

I take 1 mL per day. From the bottle..."Each mL contains: Cyanocobalamin 1000 mcg...".

Of course, I'd get advise from a Doctor that knows your physiology. I have no idea what the ramifications of taking any of these different forms of B-12 might be for any given person.

I just know that this one helps me.

Does that help?