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The resulting increase in intracellular NAD+ availability activates sirtuins particularly SIRT1, which regulates insulin sensitivity, gluconeogenesis, cholesterol synthesis, and fatty acid oxidation, and SIRT3, which governs mitochondrial antioxidant defences and energy metabolism

Precautions General Doses of vitamin B12 exceeding 10 mcg daily may produce a hematologic response in patients who have a folate deficiency

The Bottom Line Understanding how to give a B12 injection properly gives you control over your energy, cognitive function, and long-term nerve health without the hassle of weekly clinic visits