A lot depends on how bad and extensive the deterioration is and the age of the individual.
There are 4 very essential base hormones in bone regrowth, DHEA, Pregnenolone, Cholecalcipherol, and Melatonin. Additional hormones can be derived from these.
Also, there are a number of nutrients that are critical such as Calcium, Magnesium, Iodine, Selenium, etc.
There are also technologies that can help such as bone growth stimulation with electrical and vibrational frequencies.