Dougie’s Brewer’s Yeast Promotes healthy skin, hair, eyes, liver function and pets’ immune functions. Brewer’s yeast is also known to reduce anxiety in some dogs. A highly palatable powder of the yeast strain Saccharomyces cerevisiae, it’s a great source of vitamins, minerals and antioxidants – particularly B vitamins, selenium, potassium, chromium, iron, zinc and magnesium.