Sublingual B12, which bypasses the gastrointestinal tract, is the least invasive and potentially most cost-effective option, especially for individuals with impaired absorption, making it an attractive alternative for long-term and patient-friendly management (Vidal-Alaball et al., 2006)
For some people, especially those with certain genetic variations like the MTHFR mutation, converting cyanocobalamin can be a challenge
As a statement made by one of the leaders in vitamin B12 field more than 10 years ago, Carmels idea of cobalamin deficiency should not be diagnosed unless megaloblastic changes are found is still followed by many physicians and health authorities when accepting B12 deficiency diagnosis.1 But as time goes by, evidence and clinical cases showed that B12 deficiency symptoms can be seen even when B12 level in blood is within the reference range, as 200 900 pg/mL in the United States,2 and 135-650 pmol/L in Australia.3 In clinical practice, signs and symptoms of B12 deficiency start when plasma B12 levels are normal, and long historical studies showed that neurological symptoms of deficiency occur in patients without sign of anaemia
You may notice these changes before the number on the scale drops significantly, because fat loss and muscle maintenance can sometimes balance each other out on the scale
Vitamin B12 treatments are considered safe for one very simple reason B vitamins are water-soluble, which means your body naturally filters out any excess vitamin through urination
Cyanocobalamin is a synthetic B12 form requiring enzymatic conversion to active forms, whilst methylcobalamin is naturally bioactive and used directly by cells