Review (4/5): I think it's working.
So far, I think Lash Boost is working. Because product says one should use this for six-ish weeks, it may be too soon to say; but I do think my lashes are getting thicker. It's definitely easy to use, and I do apply it twice daily. I had been using Latisse in the past, which made my lashes longer but not thicker. Lash Boost seems to be making my lashes actually thicker.