Could probiotics cause a yeast infection?

Probiotics: That's an interesting question. Generally, probiotics can help to replenish or maintain the normal flora, and keep things in balance. However, there is some evidence that probiotics may cause some imbalance, because this extra 'good bacteria' uses up oxygen. This may then affect the normal balance and precipitate yeast overgrowth. However, this is not established, it's just a theory.