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First, our enteric nervous system (ENS), which is located throughout our gastrointestinal tract, helps control our same chemicals and cells as the brain to help us digest and to alert the brain when something is amiss (Ruder, 2017)
B12 injections deliver the vitamin directly into your muscle tissue, allowing for nearly 100% bioavailability
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Warnings Patients who have early Leber's disease (LHON) a hereditary disease that causes optic nerve atrophy have been found to suffer severe and swift optic atrophy when treated with vitamin B12
Oral B12 supplements have to pass through the gut, and absorption can be limited especially if you have digestive issues, take certain medications like metformin or antacids, or simply have low stomach acid
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