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

https://scarlettssuperbnews.inkharbory.com/posts/ultherapy-vs-standard-hifu-what-did-the-2024-study-say

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer for gradual skin lifting, with results peaking around 3 to 6 months. Compared to RF which heats surface layers to 40-45°C for collagen stimulation, Ultherapy reaches deeper