It didn't seem to work properly and penetrate my skin. The serum seemed to sit on top of my skin despite my tapping the needleheads on my skin. I could feel the needles, but I had lots of excess serum on my face and neck. I followed the directions in the box. Please email text or call me about this problem. My phone is 205-335-8492. Please text first so I can answer your call & not divert it to voicemail thinking it's spam. If a call does go to voicemail, please leave a message & callback number