Ive tried 2 of these and they do seem to work, my biggest concern is lack of transparency, and 100% positive 5 star reviews is alarming because there is not a chance on earth that every review is shown, so alot must be hidden. I gave a positive but not 5 star review on 2 occasions and neither were added to website, trustpilot reviews have all been removed so I won't purchase again until I've seen a video of the entire process and as for the lab charts I'd love to know what sort or laboratory produces a report with no information contained in it? they have never responded to a request to look at one in detail so all a bit confusing for me