I am a cancer survivor and my oncologist has me on monthly B12 injections administered intramuscularly. While B12 deficiency can be addressed using oral administration, it can be ineffective in patients that have absorption issues that take place in the gut. B12 deficiency can cause many problems besides fatigue. It also affects neurologic functions including neuropathy. I’ll continue with the injections. They are painless and take just a small part of my month to administer.
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