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Running a B12 deficitwhich about six percent of Americans under the age of 60and 20 percent of those over 60 do (1)puts you at risk for muscle weakness, fatigue, depression, memory issues, erectile dysfunction, and a cluster of symptoms that can be so severe that theyre debilitating
& Luz-Maria, T
J.ChenJ.ChenF.LiuQ.SunY.YanC.et al (2019)
I can always tell when a doctor has no idea what they are doing when they recommend that a patient stop taking vitamin B12 because their blood level is high
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