We all have good and bad bacteria in our system. Yeast Defense works with the body's natural system to support a healthy yeast balance. Yeast Defense offers an advanced herbal formula of caprylic acid, pau d' arco and grape fruit seed extract to support your body in its efforts to stay balanced. The probiotic bacteria in this product are cultured using a combination of vitamins, minerals and dairy proteins. Though the culture medium is removed before encapsulation, there may be traces of dairy in this product.