F.A.S.T. Conditioner works best when it is used in conjunction with the F.A.S.T Shampoo. Leaves your hair feeling smooth and manageable. Clinically proven to grow your hair up to 99% faster! The more you use the two together the better they work. The new formula of F.A.S.T conditioner with no sulfates, parabens and DEA is just as effective as the original version and guaranteed!