Pure coconut oil. Just place some in your hands and rub together (pure coconut oil is solid so the heat from your hand turns it into an oil) and apply to hair, concentrating on your ends.
I would also switch to shampoo/conditioners that are sulfate free. You will notice a HUGE difference immediately.
I would also switch to shampoo/conditioners that are sulfate free. You will notice a HUGE difference immediately.