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This is because benzyl alcohol loses its effectiveness as a preservative with repetitive use and exposure
Injections are appropriate for vegans or vegetarians with confirmed deficiency or documented absorption issues, but they are not the only effective option
Liao W-C, Wang Y-J, Huang M-C, Tseng G-F (2013) Methylcobalamin Facilitates Collateral Sprouting of Donor Axons and Innervation of Recipient Muscle in End-to-Side Neurorrhaphy in Rats
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However, B12 in an injectable form may cause some negative side effects, such as: For healthy individuals who are not at risk for B12 deficiency, a well-rounded, nutrient-rich diet should provide all the B12 their bodies need