B12 Deficiency, Thyroid Disease and The MTHFR Connection Dr Hagmeyer as someone who has an MTHFR gene mutation i have to supplement with methyl b12 via injection drip oral supplements my body doesnt make good use of it from B12 Deficiency, Thyroid Disease and The MTHFR Connection Dr Hagmeyer METABOLIC MYELOPATHIES Continuum MTHFR Mutation And The Importance of Vitamin B12 Injections The HCG Institute Mic B12 Injection