Candida yeast fungi overgrowth is only possible to have if a person does not have a vibrant, healthy inner ecology. That is a microflora, five to seven pounds of good bacteria, living in the digestive tract.
The way to erradicate the yeast overgrowth is to rebalance the bodies pH levels, so that the microflora can thrive and take a COLONIZING probiotic. Not all probiotics grow when you swallow them, and if they do not grow, then the microflora is never renourished.
The microflora has many benefits so you do want a healthy inner ecology. For instance, 85% of Seratonin is manufactured in the gut, vitamins are synthesized by the microflora, perastaltic movement regulated, colon cleaning occurs naturally w/ healthy microflora, parasites erradicated.