All the B vits are extremely important. There is a staggering number of people are are B12 deficient and 90% of the B12 supps on the market are junk and oral consumption does little to replenish B12 stores. You really should be getting lots of both adb12 and methylb12 in a chewable form and letting it dissolve under your tongue for an hour. Its really kind of a pain to take that way but aside from an injection its the only way to really get any noticeable intake.