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Most people feel a difference within 24 to 72 hours after a vitamin B12 injection, especially in energy and mental clarity
According to the 2025 meta-analysis by Alfalasi and colleagues, sublingual B12 showed an approximate 199% mean increase in serum B12 compared to approximately 307% for intramuscular injections
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For long-term storage (several months to years), vials may be placed in a freezer at approximately -80C (-112F)
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