Typically a blood test, a healthcare professional draws a small blood sample
High-dose vitamin B12 supplements taken concurrently with the injection may lead to excessive B12 levels, though toxicity from vitamin B12 excess is extremely rare due to its water-soluble nature and efficient renal excretion
A number of medical studies have shown that from the age of 70 years old, our bodies have ZERO intrinsic factor and therefore we lose the natural ability to absorb B12
Lotz-Havla AS, Wei KJ, Schiergens KA, Brunet T, Kohlhase J, Regenauer-Vandewiele S, Maier EM
Symptoms of a vitamin B12 deficiency include fatigue, weakness, pale skin, shortness of breath, tingling or numbness in the hands and feet, and memory problems
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