Choose methylcobalamin if: You have confirmed MTHFR mutations Elevated homocysteine levels Neurological or mood symptoms You tolerate methylated supplements well Choose hydroxocobalamin if: Sensitive to methyl-B12 (anxiety, insomnia) Histamine intolerance or MCAS Need gentle, balanced B12 support Want detoxification benefits Choose adenosylcobalamin if: Chronic fatigue is your primary concern Mitochondrial dysfunction Want to combine with methyl-B12 for comprehensive support Consider combination formulas: Many practitioners recommend combining forms: Methyl-B12 + Adeno-B12 (methylation + energy) Hydroxy-B12 + Adeno-B12 (gentle + energy) All three forms for comprehensive support The bottom line: For MTHFR mutations, methylcobalamin is typically most effective for supporting methylation and lowering homocysteine
While B12 can be consumed through food or supplements, injections ensure quick absorption into the bloodstream, offering immediate results
Chronic treatment should be done with an oral preparation in patients with normal intestinal absorption
Hypersensitivity to cobalt or any cobalamin is a contraindication to B12 injections
Boban Blagaic A, Blagaic V, Mirt M, Jelovac N, Dodig G, Rucman R, et al