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According to one report, 3% to 43% of older adults living independently may have low serum vitamin B12 levels, especially those with conditions such as atrophic gastritis or pernicious anaemia
The Evidence that oral supplementation can be used to effectively treat Pernicious Anaemia is weak
What is vitamin B12 (cyanocobalamin) used for
The FDA's 2024 review found no published human pharmacokinetic study that formally characterized the subcutaneous route, so these amounts are anecdotal rather than an approved clinical protocol
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