Can taking methylation supplements (B12 and folate) cause small fiber neuropathy or other neuropathies?


I know a deficiency of B12 can, but I test all normal (haven't done urine MMA). But I have had chronic muscle pain ever since taking relatively high doses of methylB12 and methylfolate. I wonder if taking either one somehow drained my B12 and caused SFN. I don't have typical neuropathy sensations, but some SFN symptoms and annecdotally, SFN can present with muscle pain.