Vitamin B12 (Cobalamin) may help to address the following conditions:
aging
Symptoms of B12 deficiency, such as fatigue and memory loss, may be confused with simple signs of aging. With age, we have less stomach acid to process B12, and oral supplementation is often effective. Monthly injections or sublingual B-12 supplements may be necessary to restore B12 levels in those whose digestive system is compromised.
growth
Vitamin B12 supplementation has been shown to significantly spur the growth of otherwise malnourished children.
alcoholism
Alcohol's adverse impact on brain function includes vitamin B12 depletion and impaired absorption. Yet B12 deficiency can be temporarily masked by alcoholism as excess B12 is released into the blood from the damaged liver.
Alzheimer's disease
Symptoms of B12 deficiency include ataxia, fatigue, slowness of thought, apathy, emaciation, moodiness, confusion, agitation, and emotional instability. Even marginal B12 deficiency over time produces an increased risk of Alzheimer's disease.
anemia
Vitamin B12 forms and regenerates red blood cells, and its deficiency results in pernicious anemia.
blood pressure (low)
Vitamin B12 helps to correct low blood pressure.
hearing problems
Studies have connected low vitamin B12 serum levels with age-related and noise-induced hearing loss, as well as tinnitus. Supplementation can help.
brain fog
Vitamin B12 deficiency can cause brain and nerve damage, and is commonly associated with brain fog. A study of 3,000 adults conducted at Tufts University found nearly 40% had B12 levels low enough to cause neurological symptoms. The optimum daily intake for vitamin B12 is an average 2-3 g.
candidiasis
A deficiency of vitamin B12 can encourage candidal overgrowth.
memory problems
Vitamin B12 deficiency is associated with cognitive impairment. Vitamin B12 can improve memory, balance, and concentration.
depression
Vitamin B12 helps to alleviate depression directly and also helps to lower homocysteine, a dangerous compound that is associated with depressed mood.
bursitis
Complete relief from bursitis has been achieved with injections of vitamin B12 for 10-14 days, at a dose of 1,000 mcg a day.
fatigue
Vitamin B12 is a popular treatment for fatigue, and can be effective even in cases where deficiency is not apparent.
lung cancer
Supplementation for one year with 750 mcg of vitamin B12 and 10-20 mg of folic acid caused precancerous changes in smokers' lungs to disappear.
immune disorders
Vitamin B12 is essential to the proper division and growth of white blood cells.
cardiovascular disease
Vitamin B12 helps prevent and treat cardiovascular disease by converting homocysteine to methionine. To assure protection, older individuals may need to take the vitamin twice daily in a sublingual form.
sleep disorders
Vitamin B12 contributes to the manufacture of melatonin, making it helpful as a sleep aid when adjusting to changes in time zone or work schedule. A 3 mg dose taken sublingually is particularly helpful for inducing sleep in older individuals, who may have difficulty absorbing B12 .
liver disease
Vitamin B12 significantly reduces jaundice, anorexia, and recovery time in cases of infective hepatitis. In such cases, B12 is best administered by injection, sublingually, or by intranasal gel.
multiple sclerosis
Multiple sclerosis patients have significantly higher than average levels of homocysteine, which is known to damage neuronal DNA. Although vitamin B12 helps to control homocysteine levels, MS patients don't metabolize B12 properly. In one study of MS patients, supplementation with large doses of the methylcobalamin form of B12 improved hearing and vision by 30 percent.
nervous irritability
A deficiency of vitamin B12 can result in irritability.
nervous system disorders
Vitamin B12 injections can ease the pain of diabetic neuropathy, peripheral neuropathy, and shingles.
reproductive disorders
Vitamin B12 is important to cellular replication, and its deficiency is associated with low sperm count and reduced sperm motility. In one study of men with low sperm counts, 57% demonstrated improvements with administration of 6,000 g of vitamin B12 per day.
male infertility
Vitamin B12 is important to cellular replication, and its deficiency is associated with low sperm count and reduced sperm motility. In one study of men with low sperm counts, fifty-seven percent demonstrated improvements with administration of 6,000 mcg of vitamin B12 per day.
sciatica
Intramuscular injections of vitamins B1 and B12 can relieve the pain of sciatica.
tongue symptoms
Vitamin B12 deficiency can result in the condition known as geographic tongue or a less dramatic presentation of deep grooves or fissures on the tongue surface. Both conditions can be reversed by supplementing for a few months with both vitamin B12 and folic acid (preferably as part of a B-complex supplement).
herpes zoster
Vitamin B12 injections can ease the pain of diabetic neuropathy, peripheral neuropathy, and shingles.
leukemia
Vitamin B-12 deficiency is a risk factor for both adult and childhood acute lymphoblastic leukemia (ALL). B12 deficiency is thought to compromise DNA repair, leading to chromosome breaks associated with the disease.
cancer
Supplementation for one year with 750 mcg of vitamin B12 and 10-20 mg of folic acid caused precancerous changes in smokers' lungs to disappear.
geographic tongue
Vitamin B12 deficiency can result in the condition known as geographic tongue or a less dramatic presentation of deep grooves or fissures on the tongue surface. Both conditions can be reversed by supplementing for a few months with both vitamin B12 and folic acid (preferably as part of a B-complex supplement).
 

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