Fosamax technically isn't a bone builder. With severe osteoporosis and a history of fracture, I would be scared to rely on prunes, but it would be helpful info as an addition to bone building meds!

This study (Funded by the Prune Boards!) says 5-6 prunes a day
https://www.medicalnewstoday.com/articles/eating-5-to-6-prunes-a-day-may-prevent-bone-loss-osteoporosis
“Our study is the first to reveal that consuming just 5-6 prunes a day prevented a loss of bone mineral density at the hip, the site of most concern for aging men and women as hip fractures commonly lead to hospitalization, diminished quality of life, and loss of independence.”
— Dr. Mary Jane De Souza

You are welcome, we also look to diet as our first approach, medicine as last resort. It is important when relying on diet to be maintain that diet daily so that the body build up a defense. As with the prunes if we just ate them now and then, it would not work, must be daily.

I’m trying to not take the drugs also. Can you share any tips you’ve found helpful? I’m taking Vit D3 with K2, magnesium. Active B12 and L-5-MTHF, and Berberine. I’m going to physical therapy for weight bearing, strengthening, core and balance exercises. I’ve increased calcium, eggs, etc in my diet, and added prunes daily. I’m limiting processed foods as well. I’m also going part time at work so I don’t sit so much … since my worst T & Z scores were in my lumbar spine and I had a sacral fracture last year (NOT from a fall). I am 58, and I want to do all I can without meds.