I had BPD/DS surgery in 2016, leaving 1.5 meters of common channel. Following this surgery, my Vitamin D levels plummeted to deficient levels. This had a cascade effect, where my hyperparathyroid (PTH) levels rose to dangerous levels, and although my calcium levels were ok, my body could not metabolize it due to low Vitamin D. So my body began to pull calcium from my bones. I now have full osteoporosis as a 55 year-old male, and break ribs and toes regularly in addition to pain.
Through the years, my physician continued to increase my oral Vitamin D dosage, eventually reaching 50,000 IU per day, but it made little difference in any lab tests. I am just not absorbing it.
I found and read clinical studies on the effectiveness of Vitamin D3 intramuscular injections, and decided to try it. Unfortunately this is not available in the US. It is done in Scandinavian countries, Australia, Canada, India, South Korea, Brazil and many other countries.
I had to jump through some hoops, but was able to get 30 doses of 600,000 IU Cholecalciferol (Vitamin D3). I only need 1 injection per 6 months. My numbers have all returned to normal. My doctor thinks he is responsible for fixing me, but I know different. I can't reverse the bone loss that has already occurred, but I can keep it from getting worse.
Take your health into your own hands when you aren't getting the right answers from your doctor.
If you are having similar lab results, do some about it before the bone damage gets bad. If you have questions or are interested in any information, message me. I encourage you to research this yourself to your own satisfaction, but I can point you to some resources. It is working for me where no amount of oral supplementation would.