With the exception of some B vitamins, changes in the vitamin and mineral
content of fermented milk products are negligible.24 Moreover, the pasteurization of
milk prior to fermentation may destroy some vitamins such as B6, B12, and folic acid,
whereas the level of thermostable vitamins (niacin and pantothenic acid) remains
unchanged. Some lactic acid bacterial strains produce a net increase in B vitamins,
notably folates, during fermentation, whereas others result in a net loss. In general,
Lb. bulgaricus uses folic acid, whereas S. thermophilus produces it.25 However,
following fermentation, the levels of some vitamins, especially B12 and folic acid
decrease during cold storage.