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Use an insulated travel case with ice packs that maintain 2 to 8 degrees Celsius
PMCID: PMC5985336 Ritelli M, Cinquina V, Venturini M, Pezzaioli L, Formenti AM, Chiarelli N, Colombi M
Large-scale, well-designed trials with proper randomization and blinding are needed to determine whether high-dose oral supplementation is as effective as intramuscular injection for increasing vitamin B 12 status and alleviating clinical symptoms of vitamin B 12 deficiency
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Too much vitamin B12 intake can cause headache, nausea and vomiting, diarrhea, fatigue, weakness, and tingling
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