Another thing to consider is wich brand of hydroxycobalamin you use
Oral/sublingual sprays absorb through mouth tissue and partially reach the GI tract
How often are B12 injections given
Specific volumes, target concentrations, and dose calculations cited in non-clinical or informal sources are not derived from authoritative data and may be inaccurate, unsafe, or based on products of unknown quality and purity
Stable gastric pentadecapeptide BPC 157, Robert's stomach cytoprotection/adaptive cytoprotection/organoprotection, and Selye's stress coping response: progress, achievements, and the future
For patients who are deficient in B12 or borderline low, correcting that deficiency may help improve fatigue, sluggishness, or weakness