This product is EXCELLENT! I've tried many products over the years and nothing works as well as SierraSil .This is my first time writing a testimonial ever, so that should tell you how powerful and quality of a product this is. After only a couple of months using SierraSil, I now feel "free"! I awake and can literally jump out of bed! I can't wait to see where my progress is in a few more weeks/ months.