Methylcobalamin
Methylcobalamin is a tier 1 form of Vitamin B12 (Cobalamin), used in 4,659 on-market products .
4,659
on-market products
tier 1
quality tier
n/a
elemental fraction
Why this tier: One of the two naturally active intracellular coenzyme forms, but per the same 2015 review there is no strong evidence it is clinically superior to cyanocobalamin for correcting deficiency. A commonly repeated "3x greater tissue retention" marketing claim (attributed to a 2015 journal study) could NOT be traced to any real paper -- treat as unverifiable/likely fabricated, not fact.
Source: Obeid R et al. 2015, PMID 25820384