Massive doses of vitamin B12 can be bad for you By Joe Graedon, M.S., and Teresa Graedon, Ph.D. July 13, 2022 The recommended dietary allowance of vitamin B12 is 2.4 micrograms.

Vitamin B12 deficiency symptoms: A certain type of headache could signal a lack of B12 (Image: GETTY) “Even in the same person, there may be extreme variations in the headaches themselves.

The dose of 2,000 micrograms of B12 is more than 800 times the recommended daily amount. So, on the face of it, this dose seems too high, but as you increase the amount in your diet, less of a ...

DEAR DR. ROACH: I am 73, and I was worried about dementia. Turns out, I am “normal.” However, the neurologist told me to take 2,000 mcg of B12 daily. My multivitamin has 100 mcg, which is ...

That being said, I recommend higher doses, at least 10 mcg, since a few people don’t absorb B12 correctly. Some medicines, such as omeprazole and other proton pump inhibitors (acid-suppressing stomach ...

Most B12 supplements sold at the pharmacy or health food stores have much greater amounts, often at or above 1,000 mcg. They are safe to take. Your body simply excretes the excess B12.