A: It can reflect increased training capacity, glycogen/water shifts, appetite changes, or lean mass gain rather than pure fat gain
The injections sit in the muscle tissue as kind of a reservoir and slowly leak out over time into the blood, explains Joshua Miller, Ph.D., a B12 researcher, and professor and chair in the Department of Nutritional Sciences at the School of Environmental and Biological Sciences at Rutgers University
Overdose of Methylcobalamin Injection Symptoms of Overdose In some cases, when much methylcobalamin is taken, it can cause symptoms like feeling lightheadedness or having a headache, or feeling nauseous, and, in some situations, even anaphylaxis could occur as a result of an overdose of methylcobalamin Too much methylcobalamin could also make certain existing medical conditions worse such, as kidney problems or heart issues
Sources: Dimet-Wiley AL, Latham CM, Brightwell CR, et al