Bosley Healthy Hair Follicle Nourisher What it is: Intensive leave-in scalp primer. What it does: Primes the scalp, helping amplify the effects when used with the other treatments. Designed to replenish follicles and helps inhibit toxins such as DHT How to use it: Apply to thinning areas, then apply a second treatment of choice such as the Bosley Professional Strength Re-growth Treatment. Healthy Hair Treatments are for both men and women who are experiencing certain types of hair loss. BosleyPro Healthy Hair Treatments include FDA certified treatments proven to re-grow hair!