You are right about many GPs not knowing a lot about nutrition. Vitamin B-12 has been well researched - there are books about it and how the lack of B-12 can cause many ills, including dementia symptoms. B-6 is often given with B-12. Ideally, you would find a doctor who understands alternative medicine, including nutrition and supplements.

Sublingual drops are often better absorbed than pills. As we age, our bodies often absorb less B-12 (and other nutrients). My personal thoughts, for me, are that these are good for us. However, there may be reasons you shouldn't take them, so do try to find a different doctor. At the very least, don't use huge doses without guidance. But you are right to investigate this.

Carol