For those that don't have malabsorption issues, when they stop eating meat, I understand that it takes a bit over a year for the Vitamin B-12 deficiency to start becoming a problem.

Basically, your body seems to be able to store it up and use it as needed over a substantial time period.

In my case, having malabsorption problems, even if I ate meat and if I could successfully digest it, I'd still have trouble getting the B12 absorbed.

Cobalamin is the largest molecule your body has to absorb. From what I understand, it is large enough that your intestine wall has to break somewhat just to get the Cobalamin in, then it heals itself.

So, with a malabsorption issue, it makes sense to take B12 by needle point.

I don't know that methylcobalamin is bad. My Doctor didn't comment about it because I decided to go with Hydroxocobalamin.

I've heard that the methyl form doesn't have to be converted in any way to be used by the body.

Also, given the physiological nuances from one person to another, one form may very well work well for one person for reasons not readily apparent yet today. If it is working, it's sure hard to argue with it.