Question: Is dairy safe for overmethylators?
There's so little methylcobalamin in milk that I think that it is totally insignificant with regards to methyl groups, coming into the methylation cycle. Generally, if you're experiencing over-methylation symptoms from methylcobalamin or methylfolate, I think the big issue is partly that you don't have enough glycine in the system, very likely, and partly that your body is over-accustomed to low methyl supply and putting more suddenly into it leading into the system being adapted to a different state than the one you're putting into it. But if you find it is, you're reacting to dairy, I would be very surprised if it was the methylcobalamin, but if you're very convinced of that, then titrate up slowly with the dairy.
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DISCLAIMER: I have a PhD in Nutritional Sciences and my expertise is in performing and evaluating nutritional research. I am not a medical doctor and nothing herein is medical advice