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It would be advisable to tell him / her that you have supplemented with B12 (since a high serum B12 level, in the ABSENCE of supplementation, can be indicative of other serious conditions, so your GP will need to know that the high level is probably due to supplements)

What additional health benefits can vitamin B12 injections provide beyond increased energy

The severity of your deficiency will impact how quickly your body responds to the B12 injection and how long it takes to feel the full benefits

If you dont have other symptoms, try using relaxation techniques and vagal maneuvers to calm your heart down Image content: This image is available to view online