B vitamins are essential for normal muscle function, a healthy nervous system and the production of serotonin, the mood - lifting chemical. (myobuddy.com)
It also helps regulate blood pressure and is needed for normal muscle contraction and nerve transmission. (healthyeating.sfgate.com)
Weight cutting doesn't refer to shedding of normal muscle mass when the issue is discussed regarding health risks, it refers to the water weight cuts done during fight week. (sbnation.com)