I found this great B12 chart online and I wish I had seen it sooner! My first ND put me on Methyl B12. She told me to keep taking it even though it made me feel much worse. If I had been aware of this chart, I would have known that my best bet was to focus on Hydroxy B12 and ADB12.
If you’ve got your 23andme results handy, take a look and see if you’ve been taking the correct form of B12 for you.