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
Very easy to order and re-order
There are also a number of health conditions that prevent patients from being able to absorb a sufficient amount of vitamin B12 both through their diet and through vitamin supplements, making injections the only method that ensures they are not deficient
How quickly will I feel the effects of a Vitamin B12 injection
Which means that you can be in, get your shot, and be out in the same time it takes to go on a lunch break