Hi, <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />

Well......I know that Selenium facilitates the function of glutathione, so IMO, I doubt it.

It may be a lack of water, or lack of exercise or too much sugar or low quality sleep or something else that you haven't thought of yet but I don't think it's the Selenium....selenium is known as the happy supplement, when I first took it, I felt great the next day and it helps with people who have mercury.......another possbility is, if you are urinating a lot, then your Potassium may be low.

The possibilities are numerous......sorry I'm not much help!