B12 injections can be very beneficial to weight loss patients, especially during the beginning of their weight loss journey
The compound appears to work by increasing intracellular NAD+ levels (through preventing nicotinamide consumption by NNMT), which activates sirtuins and enhances mitochondrial function and fatty acid oxidation, while also promoting a phenomenon called "browning" of white adipose tissue - the transformation of energy-storing white fat cells into metabolically active beige/brown adipocytes that burn fatty acids for thermogenesis rather than storing them
The second is dose and route translation : even where an effect is real in a mouse, the human-equivalent dose is not a simple body-weight scaling, and as the route section above stressed there is no human bioavailability figure to anchor an oral-versus-injected comparison
Subcutaneous injection places the peptide in the fatty tissue layer between skin and muscle, where it absorbs gradually and migrates to damaged areas
By improving your B12 levels, B12 shots for weight loss may also support better emotional well-being
