What it is
A collagen stimulator does not fill. It provokes a gradual collagen response in the treated plane, so the change appears over months rather than immediately. That makes it a poor choice for anyone who wants a result before a specific date.
It is also not reversible. Hyaluronic acid filler can be dissolved with hyaluronidase if a result is not wanted; a collagen stimulator cannot. That trade-off is discussed before you agree to a course.
