The vibration machines that reportedly build bone are low intensity vibration like Marodyne LIV and another one, possibly LifePro (I posted about it somewhere else). They cost a few thousand $. Dr. Doug Lucas has a video on YouTube about vibration exercisers. The cheaper ones are high intensity vibration and may do more harm than good for those with weak bones. I had an Elison Bolt and after listening to Margaret Martin's podcast on vibration machines, I gave it away.

My doctor just recommended I get a personal trampoline or rebounder to build my hips up.
On Alendronate, my spine got better, out of osteoporosis, but my hips, a little worse. I had to take prednisone for an autoimmune disease at a pretty high dosage for over a year and a half so that may be responsible.

Dr. Loren Fishman also has a yoga program, "12 Poses vs Osteoporosis" that has been studied and builds bone. The first series is on You Tube.

It seems the verdict is out on vibration therapy, yet I'm willing to add it to my routine. All things considered everything has risks. My opinion, Marodyne is unaffordable for many of us, but a safe choice. LIV vs a more intense machine is a choice depending on what you've read and decide what's for you. Since NASA has chosen ARED, (Advanced Resistive Exercise Device) I ordered the VT007 vibration machine bc of what I read on their site, and decided it's worth a try. 🤷‍♀️ The owner is hands on, the device is not fancy, very basic, affordable & the engineering seems sound. I need to improve in the hip area (-2.8) & hope to at least stabilize. My next DEXA/TBS will be in Jan24. I'll post my results, just hoping for just a little more help with it. Here's the site.
https://www.vibrationcare.com/vibration-therapy-osteoporosis.html