Adequate folate intake may also help protect against Alzheimer's disease .
In a 2019 study in 180 adults with mild cognitive impairment, taking 400 mcg of folate supplements daily for 2 years improved measures of brain function and reduced blood levels of proteins that are involved in Alzheimer’s disease.
Another study looked at 121 people with newly diagnosed Alzheimer's disease who were being treated with the medication donepezil.
Those who also took 1,250 mcg of folic acid per day for 6 months had improved thinking ability and less inflammation than those who took Aricept alone.

So we recommend you to supplement better folate:
Magnafolate® L Methylfolate(active folate)—maximizes the supplementation delivering a "finished" folate the body can immediately use without any kind of metabolization.
It can better supplement the folate that the body lacks.
Jinkang Pharma ,the Manufacturer & Supplier of L Methylfolate.