I have been taking msm for several weeks and have added 1000mcg B12 in the last week and yesterday I had a few irregular heart beats (missing a beat) and was very tired. Could it be the B12. I have an underactive thyroid which is being treated with 125mcg of Levothyroxine.
Supplements: I have been taking msm for several... - Thyroid UK
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Sylvia22
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How are your levels of Folate and Ferritin ? B12 needs good folate levels as they work together in the body.
Am not a medic - just a Hashimotos survivor with low B12 
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