It works for me, although I dometimes have to up the “maintenance” dose of 2/day to 3x (which is what the “quick start” package includes).
No side effects that I have noticed.
What kind of pain are you treating?
I already take all the ingredients of RF that I have researched over time and concluded they are good for me. The arthritis which put me on a cane 25 years ago is not at all in evidence since shortly after I started some of those ingredients and old age pains I had started experiencing are gone years ago.