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Freezing can compromise the integrity of the vial and potentially affect the stability and effectiveness of the benzyl alcohol preservative
Certain populations face higher deficiency risk: vegetarians and vegans (B12 is primarily found in animal products), adults over 50 (decreased stomach acid reduces B12 absorption), individuals with digestive disorders like Crohn's disease or celiac disease, and those taking medications like metformin or proton pump inhibitors
On the other hand, oral supplements must navigate through your digestive system, which can affect how much B12 your body absorbs
Blick performs a physical exam, reviews your medical history, and asks questions about your symptoms
PMID: 18612058 View source Pickart L, et al
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