Yes using fuel injector cleaner is safe and will actually help your vehicle.
When you use fuel injector cleaner in your vehicles fuel tank after every 2nd fill up it will help to keep your fuel injectors clean.
When you keep your fuel injectors clean it will help you improve engine performance, fuel mileage and make your vehicle last longer.
Adding too much fuel injector cleaner could be damaging to the vehicles fuel injectors and fuel system but adding just the right amount of fuel injector cleaner to your gas tank will help improve the fuel mileage and engine performance.
I always add a bottle of fuel injector cleaner to my gas tank every 2nd fill up and it has kept my fuel injectors clean.