Hi Zhangjin - use NB as much as you can, as often, hopefully you will see growth, but it may take longer than a few months. I had my Noogleberry cups years ago but didn't really use them very often, since lockdown I have been using them every day as often as I can fit in with stuff, and I now have growth!! Only a little, but it's growing, so if I can do it so can you!! Good luck