Does yeast contain vitamins?

Yes.  Baker’s yeast contains a variety of vitamins, mainly from the B-group type. However, baking reduces the bioavailability of vitamins and amino acids, depending on the length and intensity of the process. The shorter the baking process and the less heat-intense, the higher the survival rate of the vitamins. Having noted that, we can still say that baker’s yeast significantly contributes to the nutritional value of bread.