If your sugar, thyroid, vitamin D, and vitamin B12 are all normal, then the Satvit Plus Co Q Forte may not be the best choice for you. It is possible that you are just feeling tired due to a lack of sleep or stress. Consider getting more sleep, exercising regularly, and reducing stress. In addition, make sure you are eating a balanced diet with plenty of fruits and vegetables and avoiding processed foods. Finally, if you are still feeling tired, consider talking to your doctor about other potential causes and treatments.