Why use probiotics for yeast-balance Because yeast thrives in the intestines Fast food, stress and exposure to toxins, plus overly acidic pH levels can leave you vulnerable to yeast. Maintaining an optimal yeast balance with the right probiotics can help you stay much more comfortable. Why use Pearls YB It provides triple-strength protection for your ultimate comfort Pearls YB contains three types of Lactobacillus - clinically shown to create an intestinal environment that supports healthy yeast balance. That means comfort for you, as Pearls YB supports vaginal and urinary tract health.