Hi there ~
Great to hear that you are working actively at your age Judy ! There is unfortunately no vitamin that will make you improve your problem with focusing and retaining information. You may have to consult a neuropsychiatrist for mild cognitive impairment
. However you might want to try the over the counter multivitamins while you wait for an appointment with the doctor who will run some imaging studies and lab tests and prescribe memantine and/or donepezil
. I hope this helps.
Take care and have a lovely day !