safety of Intestinal formula #1

I am experiencing acid reflux or heartburn after I take 4 capsules of formula 1. Is this due to the hot peppers in it? Does this mean I should not take it? Also, I've checked in other herbal reference books about the longterm use of senna, aloe, and cascara and there are sources out there which don't agree that these are safe herbs to take long term. Can you advise? It does work, but I don't want to do damage to my intestines.

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