I wouldn't say this is a total dupe for the original and much more expensive brand. When I switched from using the other brand to secretKey, nothing too noticeable happened. Just to nitpick (and from my personal opinion), this brand one does not feel as moisturizing as the other one and doesn't seem give that unexplainable "glow." But, there's not science to back up this claim, so take it with a grain of salt. At the end of the day, this product might be one of those things that I will keep using, because I like it fairly enough.