1.

Exogen was popular for recovery on the old leg lengthening forum. What's the verdict on it, is it a hoax? Just seems odd that sound or ultrasound or whatever heals bones.

But then again it had to pass FDA tests and I assume its hard to fake bone healing?

2. What do people in leg lengthening think of stem cells for recovery? Say you are doing internals. Is it a hoax/just weakens the area that the stem cells were harvested from because of the additional surgery?