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The compound is a key product in the methionine cycle[1], which is responsible for synthesizing neurotransmitters like serotonin. Poor methylation in this cycle can reduce synthesis of rate-limiting compounds in the cycle, thus limiting production of neurotransmitters, perhaps inducing symptoms of mental illness.

Another product in this cycle is SAMe (S−adenosyl methionine), which has been marketed for decades as supplement for improving depression.

[1] https://www.creative-proteomics.com/services/methionine-cycl...