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The duration of a B12 injections effects varies, but most people experience benefits for a few weeks to a few months
A blood test to measure PSA, prostate specific antigen, is done to determine if prostate cancer may be present
A vitamin B12 deficiency can cause fatigue, concentration problems, or nerve damage, but not joint pain or weight gain
Chest 140 (1), 1618
Avoid taking it with caffeine, which may reduce absorption
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