why do i feel dizzy after b12 injection Common & Rare Side Effects of Vitamin Injections Feeling worse after B12 Injection:

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Heres my game plan: Test for intrinsic factor antibodies if my doctor offers this Try high-dose sublingual B12 (5000mcg daily) for 8 weeks as a test If my B12 stays below 400 pg/mL, go straight to injections Calculate the cost difference to justify the investment The 10% Rule If youre absorbing less than 10% of your oral B12 (you can estimate this by comparing your supplement dose to your blood response), weekly shots often cost less than daily high-dose pills

Facts and Myths No , it has not been scientifically proven that Vitamin B12 directly causes weight gain

As noted above, I potentially had two things working against me: no dairy or eggs and digestive issues

Continuous use without breaks can reduce receptor sensitivity and potentially cause copper dysregulation

This represents a 20-percentage-point difference