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Thats because your heart may beat extra hard or fast to try to move red blood cells through your body

10.1186/gb-2009-10-11-r130 156 WuX.ZhangL.MiaoY.YangJ.WangX.WangC.et al (2019)

Levels greater than 7 ng/mL and 13 ng/mL may be needed to optimally prevent elevated homocysteine and neural tube defects, respectively, per some research

Symptoms may include: Extreme tiredness or fatigue Breathlessness, dizziness, or feeling faint Memory issues or mental fog Pale or yellowish skin Pins and needles or numbness Palpitations or low mood Sore tongue or changes in vision If youre experiencing any of these, you may benefit from B12 testing or treatment

In clinical trials, Moderna reported them in 0.8 percent of vaccine recipients four or more days after the first shot, and in 0.2 percent of people after the second dose