It's estimated that almost 40% of the US population is B12 deficient, ranging from mild deficiencies that can cause weakness, tiredness, mood changes and neurological problems, to significant deficiencies that are associated with anemia, easy bruising, numbness in the fingers and toes, difficult walking, depression, memory loss and dementia
So what should you do
Aim for 0.3-0.5g per pound of body weight
They are often used in separate clinical contexts
Well look at the key guidelines for Vitamin B12 injections
[72] One survey of adults that had been treated with replacement cadaver GH (which has not been used anywhere in the world since 1985) during childhood showed a mildly increased incidence of colon cancer and prostate cancer, but linkage with the GH treatment was not established