Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deep...

https://penzu.com/p/bc9d0d9c667b244c

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for a deep lift, with results peaking around 3 to 6 months. Compared to RF, which heats skin to 40-45°C mainly for collagen, Ultherapy reaches deeper