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Methylcobalamin Vs Cyanocobalamin Cyanocobalamin Synthetic form used in many prescriptions and standard supplements Must be converted by the body into active forms (including methylcobalamin) Often used in prescription nasal sprays for diagnosed B12 deficiency Methylcobalamin Biologically active form of B12 already used by the body Directly supports methylation and homocysteine metabolism Favored in wellness protocols and by many performance-focused users A methyl b12 nasal spray brings these two advantages together: active B12 plus a delivery route that bypasses digestion, as documented in a Novel Methylcobalamin Nasal study examining the pharmacokinetics of intranasal methylcobalamin delivery

You should also tell your doctor if you are on any other medications, over-the-counter medicines, vitamins or supplements, including herbal supplements

doi:10.1007/s00266-013-0251-9 Claude O, Romain B, Pigneur F, Lantieri L

What Are The Health Benefits of Vitamin Injections Beyond B12

409 Moreover, resistant CCRF-CEM cells with high QPRT activity exploit amino acid catabolism as a substitute pathway for NAD + generation