Hi. First thing is to try and figure out what is causing your poor concentration. Unfortunately many things can cause this including poor sleep/poor diet/medications/certain medical conditions to name a few. I would recommend improving sleep quality 7-9 hours per night, and consulting your healthcare provider who can perform a history and physical, review your medications/supplements, and order necessary blood work. i.e. complete blood count to look for anemia and TSH to assess thyroid function. Hope this helps.