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Anderson M.E., Bridges R.J., and Meister A

Research shows that vitamin B12 has a half-life of 6 days in the blood, making it six days before the administered amount gets excreted from your body
Limitation: fiber enrichment complicates attribution

doi: 10.1155/2019/4951379 7 ChaY.ParkT.-Y.LeblancP.KimK.-S