Formula-wise, absolutely nothing. They’re the exact same recipe! The dread bar is cured, while the liquid is left as, you guessed it – liquid. As a by-product of the curing process, the dread bar will foam up when you lather it like a traditional shampoo; the liquid will not. To create this lather in the liquid shampoo we would have to add chemicals, and we’d rather keep it natural for you. In the end, this one comes down to personal choice.