Hi i Am a 65 year old male with diabetes. Hba1c 7.2% and on max dose of metformin and voglibose. Last blood test showed insufficiency in vitamin d (total) 25 ng/ml ; vitamin b12 192 pg/ml and low testosterone 191.6 ng/ml. Iron and calcium within limits as is cholesterol/ triglycerides. T3/t4/ tsh suggest thyronormalcy. Key difficulty is insufficient and interrupted sleep. 5 hrs per night -this is my major problem. 1. What should I do next since metformin is at max dosage- 2250 per day? no insulin please. Sitagliptin? 2. Is there a natural method of improving testosterone? how far below normal am i? does it need action? thank you,