Lego- I take a 2000 micrograms of methylcobalamin B12 each day. The tablets are sublingual. I also use nutritional yeast to frequently flavor foods. Despite my vegan diet I've never been b12 deficient.

You should wait 3 weeks before retesting.

I think I read a discussion here about B12 and started taking it about a month ago. I do feel that I have more energy now. I know I'm not dragging myself out of bed anymore.

I must have missed the discussion here where that was mentioned. I will go back and look. I have to say it was off my radar until I got my test results back. I feel like I eat a decent amount of meat, and a good deal of cheese, so I'm interested to see if there's a change with the supplements. I've been taking vit d consistently and my levels were just normal, so maybe I have an absorbancy problem.

Three weeks seems like a short time, but I do feel better already, so they must act fast.

I was diagnosed with slightly low vitamin B12 several months ago, after having a weird burning-tongue feeling on and off for a few months. (Yeah, that's one of the weirder symptoms.) I don't remember what specifically my numbers were, but it was just barely under the borderline, so it wasn't a real significant deficiency. I think I've been taking 1000 mcg (too lazy to get up and look!). Within a few months my level was back in the normal range but I still take it most days. I wish I could say the supplement gave me lots of energy and a better memory, but I don't think it has! Maybe I'd notice more if perimenopause wasn't messing with my body so much.

Nutritional yeast is great sprinkled on popcorn!

I was surprised to read recently that there is a type of dementia caused by B12 deficiency, which is the underlying cause of pernicious anemia. Fortunately, it's reversible with B12 injections, unlike the degenerative dementias.

Here is a link that might be useful: Scroll down to reversible dementias