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A: B12 toxicity is extremely rare because excess amounts are eliminated through urine

For those who have trouble absorbing Vitamin B12 from diet or supplements, long-term injections may be required

Heres what we recommend for elderly patients: Start with 1000 mcg of vitamin B12 weekly for 4-6 weeks Then, give 1000 mcg every 1-3 months, depending on how theyre doing Keep an eye on their vitamin B12 levels, blood counts, and brain function A study in the Journal of Gerontology stressed the need for B12 in older adults

doi:10.1038/nature13198