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Not having enough vitamin B12 in your body may cause some strange and seemingly unrelated symptoms
But the range for what's "normal" is debatable, so it's recommended to use at least two testing methods
Persistent low concentration of hCG in a nonpregnant woman [PMID: 18024529] Laboratory literature summary: Persistent low concentration of hCG in a nonpregnant woman
These findings are still emerging, and much of the research to date comes from animal and laboratory studies
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