After absorption, B12 is bound to transport proteins, 7580% to haptocorrin, which transports B12 in the blood, and 2025% to transcobalamin, which delivers B12 to the tissues, also referred to as active B12 or holo-transcobalamin
Oral Dosing Runs Higher Injectable: 200 to 500mcg per dose Oral: 500 to 1,000mcg per dose, once or twice daily, taken on an empty stomach Higher oral doses are used to make up for the fact that the gut absorbs the compound poorly compared to injections
(Persistent elevation 1000 ng/L linked to higher solid cancer risk.) Clinical significance of elevated serum cobalamin (vitamin B12)
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Firstly, restricted carbohydrate intake in KD leads to a reduction in glycolysis, the primary pathway of glucose catabolism, which is responsible for the production of NADH (140)
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