These factors determine how well the vitamin is absorbed, stored, and utilized
Its also known that nerve damage is generally caused by several factors at the same time
[10] [4] Patients should contact their GP if they experience persistent or severe side effects, signs of allergic reaction (facial swelling, difficulty breathing, severe rash), or if symptoms of B12 deficiency (such as neurological symptoms, severe fatigue, or glossitis) do not improve after several weeks of supplementation
Vitamin B12 is an essential nutrient, and those that have that are deficient in this vitamin would need vitamin B12 injections every couple of months
& Soares-Mota, M
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