EstersDoll,

Have you had your B12 levels measured by a blood test? If your sub-lingual B12 is keeping your B12 blood levels where they should be, there is no reason for injections.

I was on weekly B12 injections for 8 weeks many years ago. They helped immensely. I continued with B12 tablets with no noticeable difference once the crisis was over. I take 380 mcgs of B12 daily in tablet form and my B12 blood level is at about 1000 pg/mL which my doctor thinks is just right.

The empirical evidence gained from a blood test should over-rule any personal preferences of injections vs sub-lingual vs oral tablets.

As noted, B12 is a necessary part of the BCAA processes.