A randomized, double-blind, placebo-controlled trial in 191 older adults (75 years) with moderate vitamin B 12 deficiency (serum cobalamin concentrations of 107-210 pmol/L) without anemia provided participants with 1 mg/day of cyanocobalamin for one year (94)
Vegetarians and vegans may have low dietary intake since B12 comes almost entirely from animal products
Upstream synthesis is not anonymized through repackaging, and the on-page COA library stays accessible for review through the full procurement and audit cycle
Cyanocobalamin injections, though less commonly used in the UK than hydroxocobalamin, can similarly raise serum concentrations
The enzyme NNMT normally changes nicotinamide, a form of vitamin B3, by using methyl groups, which lowers nicotinamide adenine dinucleotide (NAD+) levels
But delivery timing is unpredictable