Hi 6197 (are you in jail, lol). I experienced results within hours of taking selenium, but I found that I had to split the daily dose up to get results tht lasted throughout the day. I truly hope it helps you, too. As far as brand, I am in the Middle East right now so I doubt the brand that I used here would be the same as what you'll find wherever you are. Just be sure that it's yeast free (very important, I found that any preparation with yeast in it actually made my symptoms worse). Best of luck!