B12 injections and increase in TSH

[Liyaelize]

I had two B12 1000mcg cynocobalimin injections per week for 3 months. My TSH went from under 1 to 6.7. Why would that be? I did not do anything else bar having my T3 and T4 doses 8 hours away from the the B12. Thanks for sharing.

[Nackapan]

I would check with the thyroid forum.

[was918]

I don't know about B12, but I know that biotin can affect thyroid test results. Are you taking any supplements or vitamins that might have biotin? You can google it and there is a recommendation to stop biotin at least 72 hrs before a thyroid test.

[Liyaelize]

No only had B12 injections and had a 6 days treatment of Methylprednisolone for a bad rash.