What is the ruling on consuming strengthening pills that contain vitamins, proteins, and brewer's yeast (bacteria used in making beer)?

The reason for the prohibition of Khamr (wine/alcohol) is its intoxicating nature, regardless of its source or method of processing. The legal maxim is: "Every intoxicant is Khamr, and every Khamr is forbidden." So, if tablets containing brewer's yeast are intoxicating, then they are forbidden. If they are not intoxicating, then they should not be called Khamr (beer/wine).