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People who take medications regularly that decrease stomach acid production can also become deficient in vitamin B12 for this reason, whether they consume enough from their diets or not

[Learn more about metabolic syndrome and its reversal] The Mitochondria-Metabolism Connection Your mitochondria are the energy-producing factories inside every cell

While many dietary supplement brands claim to boost metabolism, suppress appetite, or promote weight loss, research is lacking on these claims

Summary: Excessive vitamin B12 intake rarely causes toxicity, but very high levels from supplements or injections may be associated with skin reactions such as acne-like eruptions, though serious adverse effects remain exceptionally uncommon