This is BS! Okay, buddy, do you know better than to believe everything you read? This aggravates medical professionals such as myself; people do searches on the internet and take everything they read as fact. Did you know any idiot can post on the internet, make up a bunch of crap, and call it "truth"? Here is something you CAN believe, the source is from the University of Maryland Medical Center, supported by several peer-reviewed professional journals.
"Brewer's yeast is often used as a source of B-complex vitamins and chromium. The B-complex vitamins in brewer's yeast include B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B9 (folic acid), and H (biotin). These vitamins help break down carbohydrates, fats, and proteins, which provide the body with energy. They also support the nervous system, help maintain the muscles used for digestion, and promote the health of skin, hair, eyes, mouth, and liver."
But, you probably know all this and are just trolling, in which case I just encouraged you... ah, well. That's the way it goes.