In fact, the folate which the human body really needs is L-5-methyltetrahydrofolate calcium which is the pure  “L” or “6(S)” isomer of methylfolate and biologically active, with the CAS NO. 151533-22-1.

The “D” or “R” forms of methylfolate are not as good because they are less bioavailable. Even that is harmful for our body and . So, when you select the supplements with methylfolate, pls make sure the pure L/6S form they have.

Well, Magnafolate is the pure L/6S form methylfolate, you can get the enough folate when you see the supplements which are showing Magnafolate on their labels.

Also, other terms are often to be used as below, such as:

6S-5-methyltetrahydrofolate calcium

Calcium L-5-methyltetrahydrofolate

L-Methylfolate Calcium  

L-Methylfolate

Methylfolate

L-5-MTHF

(6S)5-MTHF

Levomefolate calcium

Active folate

Magnafolate® ,the Manufacturers & Supplier of active folate.