My mom was on inhalers for years and had bone density loss on a bone density scan in 2007.
I gave her prunes about 7 per day for 3 months and her next bone scan 2012 showed bone density improvement.
I now, give her boron, but she has not had a scan since to verify.
Here is a study on prunes reversing osteoporois.
Viewpoint: dried plum, an emerging functional food that may effecti... - PubMed - NCBI

No side effects that my mom noticed and it kept her regular.