For instance, cloves are intensely purifying as well as destructive to the eggs laid by parasites. Many people have parasites, but with adequate bile secretion and good volatile oils in spices, most of the parasites will not be able to gain a foothold in the gastrointestinal tract. One trick I have is to mix a little edible oil, such as oil of cloves or cinnamon, with a good quality flax seed oil, just a few drops and to take this by eye dropper or fill capsules. This is soothing and supports good bowel function as well as freedom from infection and infestation. Flora may need to be supplemented.
Producers tend to claim that their products are best.
Here is a situation where I feel brand loyalty is ill-advised. Regardless of what it says on the bottle, many products have virtually no shelf life at all. For a quick start, I feel Eugalan is the best, but then switch to something else. Next, one needs to avoid chlorine because it knocks out the flora. Another trick, take turmeric internally because it supports repopulation of friendly bacteria.