B12 Shots: Benefits, Uses, Safety, Cost & How They Work Benefits of Vitamin B12 Vitamin B12 deficiency can also cause menstrual irregularities, brain fog, anxiety, depression, and even a burning sensation in the feet. As these deficient RBCs deliver less oxygen to hair follicles, chronic hair Are heavy periods holding you back? From pain relief to iron supplements, hear from Dr. Rachel Miller, pediatric gynecologist, about the different methods that can be used to treat heavy menstrual bleeding.