However, when symptoms occur, often due to the underlying condition rather than the elevated B12 itself, they may include 12 : Acne Headaches Anxiety Irregular heartbeats Trouble falling or staying asleep Nausea Fatigue Dizziness The symptoms of high vitamin B 12 are vague
Most people describe a B12 shot as a quick pinch or mild sting that lasts only a few seconds
References Bray, G
An Agilent G7110B HPLC pump, degasser and autoinjector (Agilient, Santa Clara, USA) was used to auto load the samples (50 L each run, 1 to 10 mg/mL)
A warm towel, heating pad, or warm bath can be effective
However, it doesnt absorb well, and requires a methyl donor (a natural antidote and an antagonist for toxins) to detoxify it before it can convert to one of the useful forms of B12