Reply To: Hello! I have severe vitamin D deficiency (~7 ng/ml), a little high blood calcium (10.7 mg/dl) and PTH in normal range (~32). I was in contact with multiple doctors and endocrinologist, though noone can answer me why my calcium levels are slightly high as well as vitamin d levels so low. I was prescribed to take vit d supplements, though even lower non-prescripted doses makes me feel fatigued and achy. Had thyorid and neck ultrasound with no abnormalities found. What could be the reason behind this?