I also tried alpecin, both the shampoo and the liquid. I went through about 50-75% of the bottle. Didn't seem to do anything for me. Maybe I need to up the concentration of caffeine, but to be honest I felt a buzz. That scalp liquid was almost addictive as you could definitely feel it as it went into your scalp. I'd be afraid to add too much. Caffeine can cause serious issues in moderate doses. The only natural supplement (I haven't taken any pharmaceuticals) that worked was pumpkin seed oil + saw palmeto, and it gave me hormonal acne and I don't think I had any regrowth. Although I wish I hadn't stopped using it as I had almost completely stopped shedding while taking it. After stopping I lost another Norwood level in less than a year. FML. I was originally hoping to just last until Brotzu. FML. Now I'm too far gone for anything but a transplant or an actual breakthrough. FML FML FML.