I've been told to take calcium, vitamin D3 and vitamin K2 together. I took some to a friend hospitalized with a shattered neck (which healed perfectly after nearly 2 years in a halo) and his neurosurgeon read the label and noted that the vitamin K2 was very important in helping the bone shards fill in gaps and rejoin each other. My cardiologist takes the same formula as studies suggest that K2 helps protect the circulatory system from calcium build-up. I'm not a doctor so just passing on what they told me. Here's a side thought. My friends neck healing ground to a halt until they added ultrasound to his treatment, then sped up considerably. The neurosurgeon explained that the ultrasound nearly always did this. I ponder if the vibratory therapy for osteoporosis is analogous? They're both frequency patterns using energy to affect bones in the body and I'm a fan of energy medicine now. Anyone with more insight about if, how and why vibratory treatment helps bones?