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Some people have reported that after the first injection they feel tired, but it usually does not last all too long

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Additionally, the harsh acidic environment of the stomach and/or dysfunctions in R-proteins (haptocorrins) that protect B12 in the stomach, and potential degradation by gastric enzymes can compromise the stability and bioavailability of oral B12 supplements

Some symptoms include: fatigue, trouble losing weight, brain fog, blood sugar imbalances, trouble building muscle, muscle wasting, intestinal permeability, and hair loss