b12 and d3 injection Vitamin D Vs Capsule Vitamin B12 to Re-Energize and

[15] Garcia M, Gonzlez R

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For pernicious anaemia or malabsorption, intramuscular hydroxocobalamin is the NHS standard treatment, with an initial loading regimen followed by maintenance injections every 2-3 months

And yes, you are right

Before, I had been feeling constantly tired, like I was dragging myself through the day no matter how much I slept