For example, some patients get a B shot (methylcobalamin, cyanocobalamin or hydroxocobalamin) once a month in addition to weekly B-Complex shots
If you were on any dietary restrictions for other medical reasons, continue those as instructed by your doctor or dietitian
B is needed for the production of neurotransmitters such as GABA, serotonin, and dopamine, and for glycogen breakdown and hemoglobin synthesis
B Vitamins and the Brain: Mechanisms, Dose and Efficacy - A Review
For example, while the injection covers B, B, B, B, B, you still need other vitamins (like vitamin C, B folate, B if not supplemented separately, etc.) and minerals (iron, zinc, etc.) from food
Similarly, although hepatic dysfunction can occur with large niacin doses (1-3 grams daily over months) causing elevated liver enzymes or jaundice, niacinamide at 100 mg is very unlikely to have any adverse effect on the liver