Out of curiosity, how long have you been incomprehensive?
Any physical changes such as the possibility of sleep apnea?
Have you had multiple phlebotomies as of lately?
Any thyroid issues run in your family?
Are you taking Adderall now or have been?
There's several different reasons one can be blunted by cognitive impairment.
Not that I have the answer specifically. More so offering suggestions of a possible cause rather than throwing a bunch of unnecessary supplements or drugs in the mix.
Stewie, curious as to the role thyroid function could have in this situation. Could you elaborate?