Vitamin B12 is naturally found only in animal products like meat, fish, eggs, and dairy, or in fortified foods and supplements, as plants do not produce it
It is important to choose a qualified healthcare professional trained in administering vitamin B12 shots
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Age can also play a role, as stomach acid production often decreases in older individuals
The most important factor is consistency of timing and route day to day, since the mechanism works cumulatively rather than as an acute event to time around a meal
Self-administration of either compound without medical supervision represents a significant and unquantified health risk