Hi, I don't believe it contains any rice, but you can check the full ingredients here: https://www.forcefactor.com/products/leanfire_ultimate. I think the actual increase in body temperature relies solely on each individual's body. Feel free to reach out to the manufacturer with these questions, as well, and they can supply you with a little better answer :)
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Thank you for taking the time to answer and for providing the link. I hope you have a great week.