Research studies show that vitamin B12 is essential for DNA synthesis and cellular energy production
Follow-up B12 injections would only be arranged post specific scenarios
This triple mechanism distinguishes it from dual-agonist peptides like tirzepatide (GLP-1/GIP) and single-agonist compounds like semaglutide (GLP-1 only), making it the most broadly acting incretin-class compound currently under clinical investigation
However, serum B12 has a limitation: it can appear within the reference range even when cellular-level deficiency exists, because it captures both active and inactive forms of the vitamin
According to the NIH Office of Dietary Supplements, functional B12 deficiency is most commonly seen in patients with one or more of the following: Age over 50 stomach acid production declines with age, and stomach acid is required to free B12 from food PPI or H2 blocker use reflux medications suppress the acid needed for B12 absorption Metformin use, which interferes with B12 absorption directly Vegan or vegetarian diets B12 is found almost exclusively in animal products Gut conditions including celiac, IBS, SIBO, and Crohns MTHFR mutations that affect how B12 is metabolized once absorbed Heavy alcohol use The symptoms of low B12 are easy to dismiss: fatigue, brain fog, low mood, tingling in the hands or feet, weakness, and shortness of breath on mild exertion
