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097: Are there safety concerns in supplementing cyanocobalamin rather methylcobalamin in those with MTHFR polymorphisms?

Masterjohn Q&A Files Episode 97


If you're concerned about methylation-related issues, you would want to be careful with methylcobalamin supplementation in a way that you would not need to be careful about hydroxocobalamin supplementation. If you don't have a specific methylation-related goal, then I think hydroxocobalamin is the default because that's the sort of like metabolically neutral B12 in that it's not predisposed to any particular system, and it's not going to affect any system in a specific way apart from just being nutritional B12.

Then the second thing is “if you had MTHFR, is it dangerous to supplement with cyanocobalamin?” It doesn't matter. I don't think MTHFR has anything to do with methylcobalamin really.

If you don't have malabsorption of everything else, you should look at the specific causes of B12 malabsorption, which are pernicious anemia and gastritis, including subclinical gastritis driven by H. pylori in the stomach.

This Q&A can also be found as part of a much longer episode, here:

Harnessing the Power of Nutrients
Recording and Transcript of Ask Me Anything About Nutrition | March 8, 2019
Watch now (159 min) | Below you will find the time stamps for specific questions, the relevant links, the private podcast audio version, and the transcript. The time stamps are available to everyone but everything else is reserved for Masterpass members. Learn more about the Masterpass…
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The Masterjohn Q&A Files
We use Zoom, a video chatting software, in webinar mode. You can ask your question anonymously in text, but you can also ask it publicly, and you can even get "on stage" and share your mic, web cam, or screen with everyone.
Chris Masterjohn, PhD