I must say I was more than satisfied with the action of this product. It prevents food poisoning, I'm sure.
Also, I encourage the use of this product if bloating and / or gas, since coal will automatically absorb them.
Finally, it can be used after a large meal, for "better" digest.
Given that coal is black, this task necessarily. So, I recommend to wash any utensils immediately after use, since otherwise marks from coal are somewhat difficult to remove, but not impossible either.
I highly recommend this product, which can still be useful especially when traveling abroad.