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By bypassing the gastrointestinal tract, vitamin B12 injections effectively restore normal levels of the vitamin, alleviating symptoms and preventing complications

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They concluded that B12 accumulation in the placenta may represent an important factor in providing sufficient amount of this essential nutrient to the fetus (Giugliani, 1985). Due to a lack of clinical trials and case reports examining non-daily doses of B12 in pregnant or breastfeeding women, perhaps non-daily injections can provide some insight

B-12 shots vs pills for energy comes down to how depleted someone feels and how quickly they want to see change