Out of all the cartridges, I love the Grand Booster the best. I use it with my Retin-A once a week to get even greater penetration. This is a game changer in the world of nano needling!
I have a very resistant skin. I used the daily NanoChip a few times with no apparent results. With the Grand Booster I saw an immediate transformation. I use it twice a week and my skin looks amazing.