The principal aim of the report was to determine the values of the stability constants of vitamin С complexes with metals (II). The values obtained with the most popular methods: spectrophotometric, Potentiometrie, and Polarographie, were compared and contrasted. It was found that all the values were comprised within the range of 105 to 1010, with very small differences between the values determined by the three methods. Determination of the values of the stability constants may find application in other branches of science.