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Free vitamin B12 then combines with intrinsic factor a substance secreted by the stomach cellswhich enables it to be absorbed from the small intestine

ie is 150mcg injectable similar to 25mcg oral

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

Theyre a popular choice for a reason, but they arent the only optionand for many people, they arent the most effective one

Severe, long-standing damage may take longer or may be permanent, which is why early treatment matters

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