Tetrahydroisoquinolines : neurotoxin , what are the sources? Dairy?

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Isoquinoline derivatives have neurochemical properties similar to those of MPTP and they are considered to be the endogenous neurotoxins which cause Parkinson's disease. Among them, tetrahydroisoquinoline (TIQ)

sciencedirect.com/science/a...

Isoquinoline derivatives have neurochemical properties similar to those of MPTP and they are considered to be the endogenous neurotoxins which cause Parkinson's disease.

ncbi.nlm.nih.gov/pmc/articl...

Neurotoxic Effects of Tetrahydroisoquinolines and Underlying Mechanisms

Tetrahydroisoquinoline is one such parkinsonism-related toxin found predominantly in cheese. Although the amounts of this neurotoxin—even in cheese—are not very high, the concern is that the chemical may accumulate in the brain over long periods of consumption resulting in the brain damage associated with Parkinson’s diease.

(This source is biased against animal products but I believe based on other sources that the concern over Tetrahydroisoquinolines is legitimate. I WOULD LIKE TO DETERMINE WHAT DIETARY OR OTHER SOURCES OF Tetrahydroisoquinolines ARE OF GREATEST CONCERN. )

nutritionfacts.org/2013/08/...