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how long until b12 injections work Shots at Home: How, Where & Often to Inject Yourself How Long Does It Take
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2009 Feb 1;89(2):693S-696S

[8][9] Food sources of choline include peanuts, soybeans, wheat, chicken, fish, beef, cauliflower, eggs, and lettuce

Long-term storage (months to years): Freeze the lyophilized vial at 80 C (112 F)

There are no documented serious adverse effects from taking excess vitamin B12
