Was told by more than one endocrinologist that the body uses 4-6000 IU Vitamin D per day, so unless you spend a lot of time outside in the sun between 10am and 2pm, you need to be taking a Vitamin D supplement. Vitamin D3 is the best form to take; Vitamin D2 has to be converted by the body to D3 anyway, so might as well make it easier on the body and just take the D3 form.
There are 2 tests for Vitamin D - the 25 hydroxy vitamin D and the 1,25 dihydroxy vitamin D (active vitamin D). Usually, the 25 hydroxy vitamin D is the test that shows you wether or not you are deficient in vitamin D. In some situations, the 1,25 dihydroxy vitamin D test is important. See http://www.labtestsonline.org/understanding/analytes/vitamin_d/test.html for more info.
Chronic Lyme Disease, Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication/Chemical Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD ("Secondary Lupus-Like Syndrome"), Osteoporosis, chronic Lymphopenia, intermittant pancytopenia, chronic malabsorption/malnutrition, etc.; G-Tube; Currently TPN-dependent.
Meds: Pulmicort, IV Ceftazidime, Heparin (to flush PICC line), Claritin, Domperidone, Colloidal Silver (used topically), probiotics, homeopathy.