Of the ingredients, inositol has the best-studied track record but mainly as oral myo-/D-chiro-inositol in women with PCOS
Common signs of B12 deficiency include fatigue, weakness, constipation, loss of appetite, and weight loss (NIH, 2020)
Some chemotherapy drugs or antiretroviral medications (for HIV) that suppress bone marrow might also blunt the effectiveness of B therapy
There is a theoretical case for using both in certain patients, targeting different physiological mechanisms simultaneously, though this approach is under evaluation and not yet standard of care
That stubborn fat that refuses to budge, no matter how disciplined your diet or dedicated your workouts
Quite hard to relax muscles completely when you know what's coming