Interestingly, within a group of testing participants, who extended their vitamin D3 intake (instead of aldeclasitol), which maintains 50 ng/ml or higher (ie, A, A, vitamin D blood serum levels. Actually optimal vitamin d level During the three -year follow -up we should aim as experts), which reduced their risk of diabetes, with an increase of 76% compared to 206% compared to participants, with a serum level of 20 to 29 ng/ml (ie, clinical insufficiency).