###Human: I have low vitamin D and testosterone. Is this the reason for my forgetfulness? ###Assistant: Hi. Well, for your low testosterone and low vitamin D you need to take supplements. For vitamin D, I recommend Cholecalciferol sachets or tablets 60000 units weekly once for three months. Also take Calcium supplements every night. For testosterone, you need to get Testosterone injections once in 15 days. But neither low vitamin D nor low testosterone can explain your forgetfulness or confusion. It needs further evaluation to know the cause of forgetfulness or confusion. In that regard, I recommend the following tests to you. Serum vitamin B12, serum sodium, and serum cortisol (8 AM and 4 PM). Regarding your inability to lose weight, you need to increase the intensity of your exercise and go on a low-calorie diet.