If your liver doesn’t convert it quickly enough, folic acid can build up in your blood. Eating foods containing 5-MTHF instead of folic acid can prevent this from happening.

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.