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Conditions Vitamin B12 Prevents or Improves Vitamin B12 is believed to be helpful in preventing or improving the following conditions: Memory loss, Alzheimer's disease, or other dementia Fatigue or lack of concentration Weakened immune system Heart, kidney and liver disease Infertility Osteoporosis Allergies or asthma Tinnitus Skin disorders Lyme disease As an alternative to being injected with vitamin B12 for these conditions, patients are sometimes offered B12 supplements to be taken orally or applied as nasal gels

While these claims align with the proposed mechanisms , its important to set realistic expectations for outcomes

Proc Am Assoc Cancer Res 30:340, 1989

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The conversion of methionine to cystine: Experiments with radioactive sulfur