My daughter has been suffering from joint pains all over the body, she is 8 years old, she is about 120 cms ht and 28kgs weight, she has put on about 3 kgs in past 2 months, she is a bit above the advisible weight by 2-3 kgs. She has been prescribed lanzol by a rhumatologist, is this drug used for treating arthritis? She has tested negative for Anti DNA , Anti Serum , and most of the arthritis test, her Vitamin D is about 15 units (not sufficient), phosphorus 8 units (slightly over)