is sublingual b12 as effective as injections Effect of two different dosages of vitamin on cobalamin nutritional status in vegans and vegetarians with a marginal deficiency: A randomized controlled trial Vitamin B12 Injections vs. Oral
Description
Results vary, but improvements in hair, skin, and nails are typically noticed over several weeks with consistent treatment

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For patients diagnosed with a vitamin B12 deficiencyespecially when caused by problems with absorption in the digestive tract (such as pernicious anemia, certain gastrointestinal conditions, or after specific surgeries)oral supplements may not be effective

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Cells 8 , 187 (2019)
