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doi: 10.3390/BIOMEDICINES12122750 162
Assuming more is always better serum B12 above 1,000 pg/mL from supplementation is generally harmless, but persistently high B12 without supplementation warrants investigation for liver disease or myeloproliferative disorders [7]
Intramuscular injection delivers B12 directly into tissue, which is critical for patients whose digestive systems cannot absorb oral supplements effectively
Therefore, new formulations that increase absorption have been developed
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