Vitamin B12 is largely responsible for the manufacturing of red blood cells, defending your nerves, and assisting your body in converting food into usable energy
So probably a combination of both with that regard
The aged mice exhibited a longer healthspan, exerted greater physical activity, and researchers observed less disability such as cardiac diseases and musculoskeletal dysfunction, etc
doi: 10.3389/fmicb.2018.00070 30 StoffelsM.JongekrijgJ.RemijnT.KokN.van der MeerJ
This includes those with pernicious anemia or gut problems
Specifically, phentermine: Activates norepinephrine and dopamine release to decrease hunger and food intake Increases resting metabolism to burn more calories Elevates body temperature, facilitating fat burning Intensifies fat breakdown in adipose tissue Improves glucose tolerance and lowers insulin levels This powerful neurological impact reduces appetite, limits calorie intake, and optimizes fat burning