I experienced a lot of heat after a meal yesterday evening. I had baked cod and some shrimp. I was sipping a red bull over a few hours, too. I just looked up the nutrients in the seafood and I probably had about 100 mcg of selenium from the cod and shrimp. This is the only thing I could attribute the extra heat to. I know this isn't anything new to you but just thought I would throw that out there.