Vitamin D deficiency is linked to a wide variety of neuropsychiatric problems and neurodegenerative disorders (62)
Yes, unequivocally, if your fatigue is caused by a diagnosed B12 deficiency
L-carnitine supplementation enhances blood flow and oxygen supply to the muscle tissue and may help reduce the buildup of lactic acid in the muscles, which can contribute to muscle fatigue
That qualitative difference matters
These findings suggest that while bitter substances promise to improve glucose homeostasis, their potential adverse effects beyond the gastrointestinal system warrant careful consideration [196]
Images were captured with the following settings: scan modexyz, format1,024 1,024, speed440 Hz, pixel size240.50 x 240.50 x 713.35 nm, line and frame average6, z-step size0.71 m