Effect of vitamin D supplementation on glucose homeostasis among Type 2 Diabetic patients: A Randomized Clinical Trial - BETA CELL FUNCTION OR INSULIN SECRETION (HOMA B) The amount of glucose cleared from the blood in response to a dose of insulin. A score of less than 100 defined reduced B cell function. INSULIN RESISTANCE (HOMA IR) Defined as a condition when normal amount of insulin in body fails to produce the desired response . A score of greater than or equal to 2.0 defined IR. INSULIN SENSITIVITY Insulin sensitivity calculate by using the following formula is IS equal to 1 per IR (Normal is less than 3.0) VITAMIN D STATUS Vitamin D status was defined as SUFFICIENT with level of vitamin D greater than 30ng per ml and DEFICIENT with level of serum 25 (OH) vit D less than or equal to 30ng per ml.