Vibrating belt that treats low bone density gets FDA approval (engadget.com)

It might even treat hysterics...

On a more serious note, is this used on the ISS?

There is some old research suggesting that cats purr, to improve their bones density.

https://www.scientificamerican.com/article/why-do-cats-purr/

Treats? Is the FDA approval meaning it does not cause harm or that it has a benefit?