With their lower absorption rate and frequent dosing, oral supplements can slow the process
Kraus D, Yang Q, Kong D, Banks AS, Zhang L, Rodgers JT, Pirinen E, Pulinilkunnil TC, Gong F, Wang YC, Cen Y, Sauve AA, Asara JM, Peroni OD, Monia BP, Bhanot S, Alhonen L, Puigserver P, Kahn BB. Nicotinamide N-methyltransferase knockdown protects against diet-induced obesity. Nature. 2014 Apr 10;508(7495):258-62. doi: 10.1038/nature13198. PMID: 24717514; PMCID: PMC4107212
You may require additional sessions if you have a health condition requiring ongoing treatment to correct a B12 deficiency or if you have persistent symptoms
The first-line test is serum vitamin B12 measurement , with levels below 148 pmol/L generally considered deficient, though the exact threshold varies between laboratories
Following the study, it was reported that weight appeared to be reduced in all rats by over 50%, in comparison to the rats given a placebo