High does taken internally can lead to kidney damage. This product, as all medicinal products, should be administered by a physician. Cayenne pepper is also used for toothache, and as a liniment for sprains and congestion problems. It has also been suggested that cayenne pepper is useful in the relief of cluster headaches, and cayenne pepper tea is used for the common cold. It is very powerful.
Moderation is the key.
Again, use in moderation. I suggest setting a bottle of cayenne pepper on the table and allowing everyone to use as desired, rather than dumping it into the whole pot of chili. You may end up eating alone. Grinding or crushing the pepper is another good way to use it. I suggest drying it, placing it in a sealed plastic bag and running a rolling pin over it several times.