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Folic ACID will get turned into Dihydrofolate and will be all gone... except for any more you may eat due to eating many fortified cereals and bread products.

A little Folic ACID will not be a problem. The problems occur when the amount of Folic ACID outweighs the availability of L-Methyl Folate regarding the BRAIN since Folic ACID blocks up the #L-Methyl Folate [ #5-MTHF ] #Folate Receptor Alpha receptors and prevents the real thing [5-MTHF] from getting into the brain.

The rest of the body doesn't suffer from too much #Folic ACID....only the brain.
Folic ACID is synthetic ... ..more

#NMDA RECEPTORS
http://users.humboldt.edu/j...
Taking #Magnesium will help to block an otherwise over-active NMDA Receptors and… calm the brain.
HOMOCYSTEINE can occupy the #Glutamate Receptor on the NMDA Receptor and over stimulate the receptive dentritic neuron and can lead to neuronal damage or “burn out” [death].

Taking MAGNESIUM is calming because in part it blocks the NMDA Receptor and buffets the excessive stimulation by TOO MUCH HOMOCYSTEINE occupying the Glutamate Receptor site.
A synapse that is gated by only NMDA is less likely to cause an excitatory post synaptic potential (EPSP) because the ion channel is blocked ... ..more