Celiac.com 04/12/2016 - Vitamin B12 is a group of cobalt containing compounds described by Alan R. Gaby, M.D. in Nutritional Medicine called cobalamins. Methylcobalamin is the coenzyme form of B12 that is critical for human health. Hydroxocobalamin is a more stable form of B12 but it first needs to be converted to an active form before use in metabolism.
Vitamin B12 is important in DNA synthesis, red blood cell formation, homocysteine metabolism and the production of S-adenosylmethionine (SAMe). Adequate B12 is essential for proper neurological and immune function.
Animal proteins—meat, poultry, fish, eggs—are the sources of Vitamin B12 for humans. Plants do not need or produce B12. How B12 gets into your blood is a complex dance of stomach acids and intrinsic factors that starts with pepsin in the stomach splitting off the B12 from the protein compound. The intrinsic factor made by the parietal cells of the stomach attaches to the B12 to be shuttled to the ileum where receptors pull it into the blood.
Once in the blood, B12 is picked up by transcobalamin to be carried to cells throughout the body. Any excess is stored in the liver or excreted in the urine.
If inadequate intrinsic factor is available—loss from aging or proton pump inhibitor use—B12 deficiency symptoms such as macrocytic anemia, neurological disorders and psychiatric symptoms (memory loss, depression, confusion, paranoia) may occur. Severe B12 deficiency can result in intestinal damage, hyper-pigmentation of the skin, hypotension, and immune dysfunction.
The Institute of Medicine indicates that only 2 to 4 mcg Vitamin B12 is needed daily. The average American diet contains 5-15 mcg per day according to NHANES studies. Vegetarians and infants breastfed by vegan mothers are at greatest risk of developing B12 deficiency.
Other factors increase the risk of developing Vitamin B12 insufficiency. Achlorydria secondary to gastritic, gastric bypass surgery, and ileal resection for Crohn’s disease need assessment due to malabsorption. Apathy abounds throughout the medical community despite the 2009 Centers for Disease Control and Prevention statistics indicating 1 out of every 31 people over 50 being B12 deficient. With increasing numbers of gastric bypass patients and Crohn’s resections, this deficiency could be significantly higher.
Adverse symptoms can first be noted with the CBC test indicating large RBC or macrocytosis—a folate and B12 deficiency. Other symptoms may include balance problems, numb hands and feet, leg pains, early onset dementia, pre-Parkinson’s-like disease, infertility and depression.
Many physicians are poorly educated on Vitamin B12 importance since it is a vitamin and easy to treat. Treatment with methylcobalamin injections with few definitive ways to test efficacy seems to be a primary factor. A complete medical history assessing for gut inflammation, celiac disease, GERD, recent nitric oxide use in surgery, and genetic factors like MTHFR should trigger a closer look at B12 adequacy even with a normal homocysteine (HCY) plasma test. High levels of B12 on standard blood analysis usually indicates poor absorption and not intoxification of Vitamin B12. Elevated B12 results >800pg/ml frequently indicate PPI use or low stomach acid malabsorption. Lab results <350pg/ml may still be inadequate for a patient with celiac disease, gluten enteropathy or gastric bypass surgery, so supplementation should be considered.
Medications matter when considering Vitamin B12 status. Below are common drugs that impair absorption:
- Antacids- maalox, MOM, Mylanta, Tums
- Histamine blockers- Zantac, Tagamet, Axid, Pepcid
- Proton Pump Inhibitors- Prevacid, Prilosec, Nexium,. Omeprazole, Acidhex
- Metformin, Glucophage
- Celexa, Effexor, Elavil, Nardil, Paxil, Prozac, Zoloft, Wellbutrin
- Ativan, Librium, Valium, Xanax
- Viagra, Cialis, Levitra
- Compazine, Haldol, Risperdal, Tegretal
Vitamin B12 supplementation is probably the safest medical treatment available. Many people need B12 injections to show improvement in their symptoms. Effectiveness of injections depends more on frequency of administration than on amount given with each injection. Those who improve with injections rarely improve with oral or sublingual products no matter how large the dose because the routes of administration are not capable of achieving high enough absorption levels.
Treatment with Vitamin B12 needs to be continued for life. Until more research on efficacy and safety of oral B12 is available, intramuscular daily or weekly injections should be considered a standard of care, especially in celiac disease and those with gastric bypass surgery.
A 20 page handout on Digestive Wellness is available for $15 from Dr. Betty Wedman-St Louis, 17920 Gulf Blvd, Ste 606, St. Petersburg, FL 33708. It includes information on how GMO foods destroy health which will be covered in a future article.