This makes a lot of sense. Quite a lot of sense.
However, it should be brought out (and perhaps the article does this), the problem with B12 and older people is that the vitamin is absorbed in the stomach. But, many older people lose the intrinsic factor necessary for absorption. Therefore, a person can swallow as much B12 as they wish and still not get the vitamin into their system.
What is necessary are b12 injections and I contend at much higher levels than is recognized now.
While overseas, a medical person put my apparently unrelated symptoms together and developed a hypothesis that I may have pernicious anemia or perhaps a b12 deficiency. So, I began daily injections, the “loading” doses of b12. Within 2 or 3 days, I noticed a major decrease in my “fuzzy, fungus-in-the-brain” headaches and I wasn’t losing my balance as much as before. I increased the dosages and the headaches stopped. As I decreased the dose the headaches and dizziness began coming back.
That was about 1.5 years ago. I still need b12 although not quite as much as in the beginning. It does make a difference. I know this isn’t substantiated at this time by science but I’m experiencing it.