however, this is a diagnostic laboratory test interference and not a drug interaction
Also when you take B12 as a sublingual tablet or chewable form, it will usually contain sugar alcohols like xylitol etc
Seek immediate medical help if you develop symptoms of a severe allergic reaction, such as breathing difficulties, confusion, anxiety, clammy skin, and fainting.
NHS approach to B12 deficiency: NICE Clinical Knowledge Summaries recommend investigating B12 deficiency in patients presenting with macrocytic anaemia, unexplained neurological symptoms, or risk factors including pernicious anaemia, gastrectomy, malabsorption disorders, metformin use, proton pump inhibitors, or nitrous oxide exposure