Question about selenium

I was taking selenium +myo-inositol, then a couple of months ago switched to 100 mcg selenium (because it was a lot cheaper). I've decided to go back to the selenium + myo-inositol (DFH brand) but it only has 83 mcg of selenium. Could I also take the 100 mcg of selenium (I have about 50 left) or would that be too much? Or could I alternate between the two, until I've used up the selenium?