For about a decade I’ve taken 1/4 of a 5,000 mcg B12, thinking 50,000% of the MDA would be enough, but I didn’t notice any difference. I get B12 at Costco, especially when it’s reduced in the monthly booklet.
Here’s an article on Vitamin B12 is Key for Optimal Tissue Regeneration. Other B vitamins are mentioned as well. Mercola also includes good info on B12 in this article.
That’s a great article.
Here’s a pertinent quote......
“the rate of vitamin B12 deficiency in the U.S. is close to 20% in those older than 60.”
This business of age is difficult in so many disparate ways.