My family has been using the black soap for around 15 years. Both of my kids had bad acne during their teens and early 20s, and because my husband and I also were still dealing with acne in our 40s, we didn't see much hope for them growing out of it any time soon. Within the first week, we were all seeing marked improvement and less acne. It's the only face soap they still use. I have cut back to once a day (at the tender age of 61), but it's been the closest thing we've ever seen to a true miracle product.