RAD-140 can be stacked with Cardarine, yes. The benefits of this combination are multiple: first, the Cardarine gives the user increased cardiovascular performance and endurance, which assists in building muscle and other aspects of your life. The second benefit is that the Cardarine may provide some minor fat loss, though the SARM has not been associated heavily with fat-burning compared to other SARMs such as LGD-4033.
Stacks like this can really help because it cuts down on the work that you have to do, of course. Additionally, if you wanted to add other SARMs for increased or additional effects, that would be another possibility. Stacking adds on a whole new layer to SARMs that you didn’t know where there beforehand, in many respects.
With any SARM stack, make sure you research the way the two SARMs interact with one another as well as how they function apart. Be careful about what you choose to stack together. Not everything is meant to be stacked.