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Description
Cyanocobalamin Liquid API (Vitamin B12) USP is the pharmaceutical-grade, liquid form of cyanocobalamin, which is a synthetic, stable form of vitamin B12. This ingredient is used as the Active Pharmaceutical Ingredient (API) in the production of vitamin B12-containing medicines and supplements

The viable cells were quantified by the reaction with MTT

They came super fast and have worked great so far
Taking this into account, it is difficult to compare one method completely with another