Hi,

There are few different seleniums.Life Extension sells one called Super selenium which is Selenium L-selenomethione, sodium selenite and Se-Methyl L -Selenocysteine.
Selenium is available in several different forms. Each form of selenium acts along a different pathway to support healthy cell division. For optimized selenium support, one should supplement with all three forms of selenium. "

What do you think? Better than just one form of selenium?