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“The degradation losses of cyanocobalamin in the presence of increasing concentrations of thiamin and niacin ranged between 6%-13% and added sorbitol significantly prevented the loss of cyanocobalamin (p<0.05).”
International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition • 2019 | View Paper
“It was confirmed that the hydrolytic products of thiamine affect the stability of cyanocobalamin , and that low concentrations of ferric ions can protect cyanocobalamin against the effects of thiamine breakdown products, but this occurs without appreciably affecting the stability of thiamine itself.”
The Journal of pharmacy and pharmacology • 1962 | View Paper
“There are several previously reported observations which suggest that this rate might be much slower for cyanocobalamin than for some of the other watersoluble vitamins, such as thiamine , nicotinic acid (niacin), and ascorbic acid.”