My nails have always been dreadful but after just ONE application before bed I couldn't believe the noticeable difference in the morning. I applied it every day since while watching tele but didn't rub it in. Instead I just sit still until it soaks into my cuticles and nail beds, so none is wasted on my fingertips, and I do that just before eating my cereal each morning too now. After 2 weeks I have enough length on my nails to shape and paint them, and they are super strong. I have psoriasis in several nails and deep ridges in most, but they are not peeling or breaking as they normally do, and they look much better. I've used 1/3 of the pen in 3 weeks now so a 3ml pen will only last me 2 months - 9 weeks, but I'd rather be using plenty and getting great results than scrimp on the application and not see this fabulous improvement. Cost may be prohibitive at times but it's so nice not having to hide my awful nails any more. I definitely recommend this product.