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The short answer is reassuring - vitamin B12 itself does not cause drug test positives

Thats not conspiracy theory territory its just how pharmaceutical regulation has historically worked

That should give you a better understanding of what causes B12 side effects

For instance, gastric cancer can disrupt the production of intrinsic factor, while colorectal cancer may interfere with nutrient absorption due to changes in the intestinal lining

When I clicked on the link to book the appointment, I was directed to a long questionnaire about my health, then referred for a panel of blood tests, and I had to send through a health summary, including any past scans or results