B12 injections are a fast, efficient way to replenish those levels
Mikhailova TL et al
Practical Implications Food, BAC, and Driving Safety Does Food Affect Breathalyzer Results
Gianello (PubMed) Research Focus : Mechanistic Preclinical Research Title : Development of a Human Growth Hormone Peptide Analogue AOD9604 into an Anti-Obesity Drug (Book chapter, Peptides: The Wave of the Future, APSY vol 7, 2001) Authors : Woei-Jia Jiang, Robert Gianello, Mark Heffernan, Esra Ogru, Roksan Libinaki, Frank Ng (SpringerLink) Research Focus : Preclinical Lipid Metabolism Studies (Mice) Title : The effects of human GH and its lipolytic fragment (AOD9604) on lipid metabolism following chronic treatment in obese mice and -AR knockout mice (Endocrinology, Dec 2001) Authors : M
But it seems most common to see B12 half-life in plasma reported as 6 days, for example in the cyanocobalamin pharmaceutical insert : s3-us-west-2.amazonaws.com/