Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating...

https://star-wiki.win/index.php/How_Long_Does_Ultherapy_Take_to_Show_Results_%E2%80%94_4_to_6_Weeks_or_Longer%3F

Ultherapy uses focused ultrasound to target the 4.5 mm SMAS layer, stimulating deeper collagen production with results that peak around 3 to 6 months. Unlike RF, which heats skin to 40-45°C for surface tightening, Ultherapy reaches deeper for lifting