Nutritional Yeast has been deactivated so that it will not grow in the body. I have no business interest in this supplement. Both Red Star and Bragg’s produce Nutritional Yeast. I recommend it because I have benefited from it. B vitamins support nerves in the brain and the rest of the body, improving focus and debilitating depression if it was due to deficiency, and evening out moods to “normal” levels of sadness and happiness. Many people may need to take B-complex daily due to the intensive modern lifestyle taxing the nervous system, resulting in depression or anxiety. Multivitamins may not allow enough absorption of the essential vitamins in B-complex, even when included. An additional supplement of B-complex provides gentle support for the nervous system, with a low enough dosage so that it can be taken in the morning and evening so that deficiency is avoided. Deactivated nutritional yeast is a food-based alternative that contains B vitamins. Recipes using it can be found online. B12 is a special case, requiring a sublingual tablet that dissolves under the tongue to improve absorption. Following these recommendations has benefited me for all of my adult life. Best wishes to you and yours.