The evidence is not empty, but it is narrower than many online claims suggest
Here are the dosages you can expect from different B12 options
For some substances, it is important to think of the human or animal body as being made up of several parts, each with its own affinity for the substance, and each part with a different biological half-life (physiologically-based pharmacokinetic modelling)
Compared with mock cells, no apparent differences in concentrations of reduced or oxidized GSH were observed in GSTP1 -transfected cells
"CagriSema efficacy and safety in obesity treatment: Phase 3 REDEFINE trial results." The Lancet Diabetes & Endocrinology , 12(3), 201-213
This could cause a potential response bias, as more affected patients might be more prone to complete the forms