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However, population-based studies performed in Catalonia and the Canary Islands [7, 8], both of which used a serum vitamin B12 cut-off of 200 pg/ml, returned values of 1.9% and 3.4% respectively
Shanmugam G, Kent B, Alsaidwadi T, Baskett R

A spokesperson for Harshbarger could not immediately provide comment when reached by phone
John Myers, was concerned that just a tiny portion of the vitamins taken by supplementation or diet was actually absorbed into the bloodstream, so a different method was created

Methods 13 , 352358 (2016)