Methylation, simply put, is the addition of methyl to a molecule.
An example: Serotonin is methylated to form melatonin.
Low catecholamines and serotonin. Undermethylation of both the dopamine/norepinephrine cycle and the serotonin cycle often leads to low levels of these neurotransmitters.
Folic acid accumulation. Since folic acid is not being easily methylated into its more active form, it tends to accumulate.
What the methylation cycle does:
1. Provides methyl to create phosphatidylcholine, melatonin, epinephrine, carnitine, Co-Q10, creatine, and other molecules critical to mental and physical functioning.
2. Helps govern (usually silencing) gene expression (the process by which DNA manifests the directives encoded within it, by causing specific proteins or RNA to be produced).
3. Helps regulate the formation of taurine, cysteine, glutathione and other sulfur molecules.
For more info, see my book, Natural Healing for Bipolar Disorder