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(Updated 2021 Jun 7)

Appendices Appendix 1: Literature Search Strategies Literature Search - Vitamin B12 Economic Evidence-Based Analysis Search date: June 3, 2013 Databases searched: OVID MEDLINE, MEDLINE In-Process and Other Non-Indexed Citations, EMBASE

Some patients receiving intramuscular injections may experience localized injection site reactions such as pain, redness, or irritation, but serious injection site complications are uncommon

More Positive Attributes with methylcobalamin b12 capsules: Methylcobalamin or methylated B-12 is the most pure, active, bioavailable coenzyme form of B-12

The neuropsychiatry of vitamin B12 deficiency in elderly patients

On the other hand, oral supplements are processed through the digestive system, which might slow down absorption and the onset of benefits