DS Laboratories Spectral F7 utilises complex peptide astressin-B which helps boost strength at the base of the hair follicle at the start of growth, thus is perfect for use in the early stages of hair thinning. A clear positive counter-action to stress, clinical trials have proven the powerful effects of this innovative new formulation. Directions of use: Apply about 10 sprays evenly all over the scalp after washing in the morning and evening. Do not rinse.