Is it safe to eat a sandwich? I mean it probably is, but you could choke on the sandwich, you might be allergic to something on the sandwich.
Define safe lol.
Can you stack true shred and 4 Andro, yes, is it safe, most likely. But you could get high blood pressure, gyno and potentially a few other side effects. Those are the risks when you play with your hormones.
It's definitely on the safer side of OTC performance enhancing drugs