sure they can, but make sure you keep the doses at least half of what they normally should be... personally, if it were me, i would just pick one... think about it... you are only going to get so much out of each of them by doing that and ultimately, i would rather get the most out of one or the other... here is a link to dga organ st which you need for protection... https://www.dganutrition.com/product/organ-st/