Probably yes, but its not much to matter for me
Metabolism of selenite to selenosugar and trimethylselenonium in vivo: tissue dependency and requirement for S-adenosylmethionine-dependent methylation
Swallowed B12 Capsules: Absorbed through digestion, which can be limited (especially with age or low stomach acid)
Purity verification is one of the most important quality indicators researchers consider when sourcing peptides, as it helps reduce unwanted variables during laboratory investigations
FBCM is currently considered to be the most common cause of vitamin B12 deficiency, caused by impairment in the release of the vitamin from food, commonly because of conditions such as gastritis, achlorhydria, gastrectomy, use of antacids, or proton pump inhibitors (PPIs), gastric atrophy in the elderly, and Helicobacter pylori infection (63, 74)
10.1016/j.anireprosci.2005.05.029 64