Hello, I was just tested for Vit D again and it is very low. The Endocrinologist thinks my parathyroid is acting up because of the low vit d. Anybody have any thoughts on that? I do have absorption issues and I’m diabetic with lots of food allergies. I do feel better since adding antihistamines. I couldn’t do zrytec due to allergies to some ingredients. I’m using an generic Claritin that has fewer additives. I am much less constipated after a week or so..we’ll see if long term use makes a difference. My stomach certainly has calmed down and I’m on a low dose, so far so good.