I have tried them on an empty stomach.. banana before taking.. I've taken 1 then 1 an hr later.. I have tried 2 at a time... I have taken 2 a day.. 4 a day... 6 a day... and nothing.. I don't know what's going on.. no rise in temp; I am starving and absolutely NO ENERGY!! That's why I thought I should ask... just in case I didn't actually get them.