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When absorbed directly through the gut, as food or tablets, your body will only take on as much B12 as it needs, and the excess will pass through your urine

[DOI] [PMC free article] [PubMed] [Google Scholar] 32.Day M, Oliver AW, Pearl LH

If you must freeze (to preserve excess), accept that some potency loss will occur and that portion should be used more quickly once thawed

Prolonged deficiency can lead to anemia and nerve damage
Homocysteine and dementia: an international Consensus Statement