Most food products are not going to contain enough active ingredients to reach therapeutic levels. In addition, most store bought yogurt is highly processed with all kinds of added ingredients that in the long run are going to be more harmful than what little effect you think you will achieving from the small amount of lactoferrin it may contain. The biggest down side to most store bought yogurts is the added sugars - which by itself is one of the biggest cause of chronic disease. Yogurt is good, but it must be organic plain yogurt or home made from organic or fresh dairy, which most people do not have a palate for because it is not sweet. Add berries to the unsweetened yogurt. This will add some sweetness plus the antioxidant benefits of the berries. Other than this, there are no healthy yogurts out there. For specific purpose, supplements are better. For overall health condition, good nutrition is best.