When it comes to such discussion we need to discuss it legally, scientifically, and logically. These are not always in agreement.
LEGALLY - It is THE official stance of Medicis, the producer of Restylane and Perlane that the safety of Restylane and Perlane for use during pregnancy, in breastfeeding females or in patients under 18 years has not been established.
You may find out more about this at www.restylaneusa.com where you will find links to both the Restylane and Perlane Package Labeling.
SCIENTIFICALLY - as above. Not enough studies to prove it one way or another.
Logically - Hyaluronic acid is a sugar naturally found in our joints and eye ball. When injected it stays put and attracts water. There is no LOGICAL reason why it would hurt anything. BUT...the company producing it will not stick its neck out and tell you to use it without abundant research nor would any doctor for fear that were anything to happen, despite the logic, he/she would expose themselves to a lawsuit.
So, judge for yourself.