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The search included meta-analyses, randomized controlled trials, clinical trials, and reviews
B12 blood levels just dont represent true B12 status reliably enough, and too many people are deficient even when their results fall within the normal B12 levels chart
Delayed Treatment: Vitamin B12 deficiency left untreated for longer than 3 months may cause permanent spinal cord and nerve damage
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Mild nausea and digestive discomfort Some users report mild nausea, particularly when injecting on an empty stomach first thing in the morning
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