★★★★★
The stuff is STRONG, it's an old folklore remedy which almost always works, for anybody, any age, any reason.
For long term loose stools with intermittent diarrhea, try a wheat-free gluten free diet for a month. Research this online, as wheat is hidden "everywhere," for instance there is apparently only one spice company which does NOT add wheat flour to its spices --- SO, you see, it's VERY easy to be exposed to wheat gluten in processed foods or eating in restaurants, no matter what one orders.
HIGH dose biotin can be "miraculous" for some folks -- get the FIVE-MILLIGRAM bottles at the health food store. I was amazed the first time that I swallowed 25-MILLIGRAMS of biotin, as that "expensive" bottle of this B-Vitamin was certainly cheaper than the many medical tests.
For a long term solution, massive supplementation with very large amounts of acidophilus has been successful.