Thanks for your input! I’ve been working with specialists, and my nephrologist does not suspect kidney issues. My parathyroid function has been evaluated, and while my PTH has fluctuated, my specialist does not think it’s a primary issue. I’m taking D3, and I’ve been increasing my dose significantly over the past year, but my levels still aren’t rising. Celiac hasn’t been ruled out completely, but my nephrologist doesn’t think it’s likely. That’s why I’m wondering if there are other absorption-related factors I should be considering.