When I was doing my own research into B12 the top 2 tested brands are Jarrow and Enzymatic Therapy. I do have a site that I got my info from, it's on another forum that has all the test results, but I don't want to be rude and post it here if that is not cool, but I found it to be intensive studies so I went and bought both brands.

They are both sublingual and my personal experience has been great, but I use both name brands everyday so i couldn't say which is better or not. I figured if I bought the top 2 tested then I was covered, lol.

Edit to say I take 5mg which is 5,000 mcg daily, which is the amount my research showed worked.

I am not discounting anything MrsD said, simply stating my own belief/research and what I do and believe in personally.