PLEASE NOTE: ALTHOUGH THE REFERENCE RANGE FOR VITAMIN B12 IS 200-1100 PG/ML, IT HAS BEEN REPORTED THAT BETWEEN 5 AND 10% OF PATIENTS WITH VALUES BETWEEN 200-400 PG/ML MAY EXPERIENCE NEUROPSYCHIATRIC AND HEMATOLOGIC ABNORMALITIES DUE TO OCCULT B12 DEFICIENCY; LESS THAN 1% OF PATIENTS WITH VALUES ABOVE 400 PG/ML WILL HAVE SYMPTOMS.
Here is a snippet from a link that I will post: Vitamin B12 deficiency
Studies have shown that a deficiency of vitamin B12 can lead to abnormal neurologic and psychiatric symptoms. These symptoms may include: ataxia (shaky movements and unsteady gait), muscle weakness, spasticity, incontinence, hypotension (low blood pressure), vision problems, dementia, psychoses, and mood disturbances. Researchers report that these symptoms may occur when vitamin B12 levels are just slightly lower than normal and are considerably above the levels normally associated with anemia. People at risk for vitamin B12 deficiency include strict vegetarians, elderly people, and people with increased vitamin B12 requirements associated with pregnancy, thyrotoxicosis, hemolytic anemia, hemorrhage, malignancy, liver or kidney disease. Administering vitamin B12 orally, intramuscularly, or intranasally is effective for preventing and treating dietary vitamin B12 deficiency.
Here is the link: http://www.mayoclini... ... vitaminb12
I have talked to other people that have looked into this, and they are finding links to chronic fatigue and other auto immune types of disorders due to low levels of B12. My level is 316. So, I bought some sublingual tabs today. Many people get the shots intramuscularly, but no thanks. When you take a supplement, it doesn't absorb as well as sublingually or via a shot, and the link explains why.