Iused Procerin for the last 3 months. After the first month I saw some regrowth. After 3 months I got a good regrowth of hair that I lost on the scalp and on the front at the hair line. I stopped 1 1/2 months to get a blood test regarding liver and kidney effect. Nothing is harmful to those 2 organs.So I plan to reuse Procerin for more result. During that 1 and 1/2 months stopping I didn't see any falling of regrowth hair. I am satisfied with Procerin. It works for me.