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B12 injections are a dietary supplement and should be used under the supervision of a licensed healthcare provider
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Testing for MTHFR Variants To know if you carry a C677T or A1298C variant in the MTHFR gene, you can either try to order genetic testing for MTHFR mutations through your healthcare provider, or simply get an MTHFR testing home kit, which may be both quicker and cheaper
Almost every other peptide is encoded by nuclear DNA
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