Do Thread Lifts really boost collagen?

Good Evening, I have been told that thread lifts actually boost your collagen. But of course, I’m told this by individuals who make their living doing them. My concern is that as the effects wear off, my skin will appear saggy since it was “stretched” from the procedure thus necessitating constant upkeep/repeat treatments. Is this true? But for risk of asymmetry or puckering, any other risks I need to be aware of first?