The superior rate of absorption of B12 injections means that they can be administered every 3-6 months
Unfortunately, there is significant evidence to suggest that one of the most popular third-party testing labs does not use scientifically sound methodologies and, in some cases, has fabricated results
For example, in animal studies, methylcobalamin significantly prolonged the survival of mice with cancer, while cyanocobalamin was completely ineffective (6)
Its an incredibly effective preservative, but its efficacy isn't infinite, and it's certainly not invincible
In developing countries, B12 deficiency is much higher
Water distribution depends primarily on the concentration of electrolytes in the body compartments and sodium (Na+) plays a major role in maintaining physiologic equilibrium