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

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

Ultherapy uses focused ultrasound targeting the 4.5 mm SMAS layer, stimulating collagen deep under the skin for a natural lift